Twinning monozygotic. Medical search. Frequent questions

Among numerous causes, premature ovarian failure (POF) frequently has a genetic aetiology and normal menopausal age is strongly heritable judging by the greater concordance between monozygotic (MZ) than dizygotic twins (Snieder et al. (infertile.com)
Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. (wikipedia.org)
better source needed] The vast majority of twins are either dizygotic (fraternal) or monozygotic (identical). (wikipedia.org)
Dizygotic (DZ) or fraternal twins (also referred to as "non-identical twins", "dissimilar twins", "biovular twins", and, informally in the case of females, "sororal twins") usually occur when two fertilized eggs are implanted in the uterus wall at the same time. (wikipedia.org)
Dizygotic twins, like any other siblings, will practically always have different sequences on each chromosome, due to chromosomal crossover during meiosis. (wikipedia.org)
Dizygotic twins share only 50 percent of each other's genes, which resemble amongst siblings that are conceived and born at different times. (wikipedia.org)
Like any other siblings, dizygotic twins may look similar, particularly as they are the same age. (wikipedia.org)
However, dizygotic twins may also look very different from each other (for example, be of opposite sexes). (wikipedia.org)
Studies show that there is a genetic proclivity for dizygotic twinning. (wikipedia.org)
Dizygotic twinning ranges from six per thousand births in Japan (similar to the rate of monozygotic twins) to 14 and more per thousand in some African countries. (wikipedia.org)
Dizygotic twins are also more common for older mothers, with twinning rates doubling in mothers over the age of 35. (wikipedia.org)
By integrating data on the immune profiles of healthy monozygotic and dizygotic twin pairs, we estimated the variance in CD25 expression by helper T cells displaying a naive phenotype to be largely driven by genetic and shared early environmental influences. (nature.com)

Twin-twin transfusion syndrome (TTTS) is a serious complication of monozygotic monochorionic twinning in which shared placental blood vessels allow shunting of blood away from one twin (the donor) to the co-twin (the recipient). (medscape.com)
Conjoined twins are a rare complication of monozygotic twinning and are associated with high perinatal mortality. (hindawi.com)

There is no known genetic link for identical twinning. (wikipedia.org)
OBJECTIVE: To analyze genetic differences between 2 pairs of monozygotic twins that had discordant aortic valve morphology, with 1 twin in each pair having a BAV and the other having a trileaflet aortic valve. (elsevierpure.com)
MAIN OUTCOMES AND MEASURES: Genetic coding variations between monozygotic twins using whole-exome sequencing and targeted gene sequencing. (elsevierpure.com)
Genetic sequencing methods identified no pathogenic sequence changes between the twins in each pair. (elsevierpure.com)
A novel study of twins who have significant intrapair differences in body mass index (BMI) shows that in the majority of cases, the twin with the higher BMI is the one that veers from their genetic predisposition, based on a polygenic risk score (PRS) for BMI. (medscape.com)
While previous studies have evaluated curious cases of differences in weight between twins, the study is unique in investigating whether the higher or lower weighted twin deviates from their genetic predisposition. (medscape.com)
Twin studies report genetic and individual-level environmental underpinnings in the aetiology of both depression and HRQL, but there is limited twin research exploring this association further. (plos.org)
3 Department of Twin Research and Genetic Epidemiology, King's College London, London SE1 7EH, UK. (nih.gov)
Here we investigated the peripheral immune signatures of 61 monozygotic twin pairs discordant for MS to dissect the influence of genetic predisposition and environmental factors. (nature.com)
Nonetheless, the expanding helper T cells of twins with MS, which were also elevated in non-twin patients with MS, emerged independent of the individual genetic makeup. (nature.com)
Here we conducted an in-depth pairwise analysis of the systemic immune compartment of 61 monozygotic twin pairs discordant for MS, in which both siblings carry the same genetic and early-life environmental risk for the disease, yet only one is affected by MS. This approach thus eliminated the majority of bias attributed to variable genetic and early environmental influences in a heterogenous population 17 , 18 . (nature.com)
M any scientists once believed that physical similarities between identical twins are genetic, while their personalities, intelligence and other differences between them are an effect of their environment. (youdao.com)
You look at identical twins , monozygotic twins who share the same genetic profile. (youdao.com)
The study was a heritability analysis of 192 pairs of twins, which attributed 37 percent of the variation in risk of autism to genetic factors and 55 percent to shared environmental factors . (cdc.gov)

Method: Four dermatoglyphic markers of prenatal growth were obtained by established procedures from 26 monozygotic twin pairs discordant for schizophrenia, 13 monozygotic twin pairs concordant for schizophrenia, and several normal monozygotic twin samples. (missouristate.edu)
Nongenetic pathologic developments of brain-wave patterns in monozygotic twins discordant and concordant for schizophrenia. (uni-heidelberg.de)
Yet our investigations into mz twins discordant and concordant for schizophrenia yielded a significantly reduced within-pair EEG concordance for both, the pairs discordant for schizophrenia and the pairs concordant for schizophrenia (with concordance for schizophrenia assessed through a syndrome-oriented approach). (uni-heidelberg.de)
Consequently, EEG anomalies associated with schizophrenia and manifested differently in the mz co-twins concordant for schizophrenia are likely the effect of nongenetic, pathologic processes that evolved independently in the co-twins' genetically identical brains once the illness began to progress. (uni-heidelberg.de)

Cite this: Differences in Twins Suggest Obesity Veers From Genetics - Medscape - Nov 21, 2023. (medscape.com)
Objective: This co-twin study investigated monozygotic twins who were discordant for schizophrenia for evidence of prenatal growth differences between the affected and well co-twins. (missouristate.edu)
Results: The a-b ridge count differences between the affected and well co-twins were greater than those found for concordant and normal monozygotic pairs. (missouristate.edu)
In contrast, no significant differences were found between the affected twins and their well co-twins on markers associated with fetal development before 13 or after 15 weeks estimated gestational age. (missouristate.edu)
The main differences were the lower pressure pain threshold and higher hyperalgesia locally presented by TMD- Twin . (bvsalud.org)
The aim was to evaluate differences of salivary protein expression in the CFS patient in respect to his healthy twin. (biomedcentral.com)
Brain structural differences in monozygotic twins discordant for body mass index. (mpg.de)

In particular, the within-pair EEG concordance of monozygotic (mz) twins was found to be typically as high as r = 0.81 across channels and frequency bands, thus being comparable to that between repeated assessments on the same individual with typically r = 0.83. (uni-heidelberg.de)

Women who have a family history of fraternal twins have a higher chance of producing fraternal twins themselves, as there is a genetically linked tendency to hyper-ovulate. (wikipedia.org)
Among the twin pairs, the twin with the higher BMI of the two more frequently deviated from their genetically predicted BMI (approximately two thirds) compared with the lower-weight twin, while those who were the lower weight of the two deviated from their predicted BMI approximately a third of the time. (medscape.com)
Together, our matched-pair analysis of the extended twin approach allowed us to discern genetically and environmentally determined features of an MS-associated immune signature. (nature.com)
The study of monozgotic twins can elucidate possible environmental causes for a disease in genetically identical subjects. (jamanetwork.com)
eg, bone, bone marrow, and skin grafts) Genetically identical (syngeneic [between monozygotic twins]) donor tissue (isografts) Genetically. (msdmanuals.com)

A series of monozygotic (MZ) twin pairs discordant for premature ovarian failure presented an unusual opportunity to study ovarian transplantation . (infertile.com)
The aim of this study was to investigate the relationship between poor motor ability and anxious and depressive symptomatology in child and adolescent monozygotic twins. (edu.au)
Our study was conducted in a monozygotic twin cohort of adult twin pairs (n = 21) all discordant for asthma. (nih.gov)
The results of the current study provide evidence for differential function of T cell subsets in monozygotic twins discordant for asthma that are regulated by changes in DNA methylation. (nih.gov)
We had quite a few when we initially pulled the articles on this kind of topic, but we determined studies to be eligible if they used this co-twin control design, and that's where you have a pair of twins participate in a study, and for our review, we were specifically looking at twins that were discordant for autism, clinical symptoms, or traits. (acamh.org)
The study included 3227 twin pairs of the same gender from the Older Finnish Twin Cohort, consisting of twins born before 1958 and alive in 1974 in Finland. (medscape.com)
Data for 3,948 participants came from the Colombo Twin and Singleton Follow-up Study (CoTaSS-2). (plos.org)
The Colombo Twin and Singleton study was funded in whole, or in part, by the Wellcome Trust [Grant number 093206/Z/10/Z], https://wellcome.org . (plos.org)
Conversely, a registry-based study investigated the familial recurrence rate of MS and revealed that monozygotic twin pairs displayed the highest familial risk (17% age-adjusted risk for the unaffected twin) of developing MS, indicating a strong heritable effect 8 . (nature.com)
Our study considered whether children who do not reach their potential birthweight, as indexed by the weight of their heavier twin, also do not attain their potential IQ. (uel.ac.uk)
METHOD: Thirty healthy, never-depressed monozygotic (MZ) twins with a co-twin history of depression (high risk group: n = 13) or without co-twin history of depression (low-risk group: n = 17) were enrolled in a functional magnetic resonance imaging (fMRI) study. (ox.ac.uk)
The aim of this study is to report a clinical case of monozygotic twins discordant for pain -related temporomandibular joint disorder (TMD) from a cognitive-behavioral-emotional phenotypic analysis , from the comparison of clinical variables of pain , history of exposure to painful procedures in early childhood, and coping with pain . (bvsalud.org)
note = "Funding Information: The authors gratefully acknowledge the ongoing contribution of the{\^A} participants{\^A} in the Twins Early Development Study (TEDS){\^A} and their families. (psu.edu)
In the present study, we used a proteomic approach to evaluate the global changes in the salivary profile in a couple of monozygotic twins who were discordant for CFS. (biomedcentral.com)
This study shows the presence of differentially expressed proteins in the saliva of the couple of monozygotic twins discordant for CFS, probably related to the disease. (biomedcentral.com)
A monozygotic co-twin control study in men. (erowid.org)
The obese brain as a heritable phenotype: A combined morphometry and twin study. (mpg.de)
The first study asks if health and educational attainment are related within monozygotic twin (MZ) pairs. (lu.se)

specimen of human twins demonstrates for the first time their actual origin from a single yolk sac, and hence from a single ovum. (edu.au)

Relying on a cohort of monozygotic twins discordant for asthma we sought to determine if epigenetic modifications in T cells were associated with current asthma and explored whether such modifications were associated with second hand smoke exposures. (nih.gov)

Monozygotic twin girls are reported, one of whom has the typical clinical features of Duchenne muscular dystrophy despite a normal female karyotype. (bmj.com)
This segregation was followed by, and may even have resulted in, twinning into a female pair, one normal and one with the full clinical features of the disease. (bmj.com)
In each pair, the twin with a BAV underwent surgical aortic valve replacement for clinical indications. (elsevierpure.com)
Discordant Clinical Outcomes in a Monozygotic Dichorionic-Diamniotic Twin Pregnancy with Early Zika Virus Exposure. (cdc.gov)

Twins are two offspring produced by the same pregnancy. (wikipedia.org)
Many times, the results of this test are the first indication that this is a twin pregnancy. (twinslist.org)
Here we present a case of conjoined twins in a triplet pregnancy diagnosed at 13 of weeks gestation. (hindawi.com)
This case represents to our knowledge the only MRI images of conjoined twins in a triplet pregnancy and demonstrates how 3D imaging can be used to better counsel patients about management options. (hindawi.com)
Conjoined twins within a triplet pregnancy are very rare and a recent review suggested the incidence is less than one in a million deliveries [ 3 ]. (hindawi.com)
The purpose of this report is to describe the presentation and management of a dichorionic triplet pregnancy complicated by conjoined twins. (hindawi.com)
MRI images of conjoined twins in a triplet pregnancy. (hindawi.com)
The parents were counseled and options discussed included (1) continue the pregnancy understanding that the shared heart meant the conjoined twins could not be separated should they survive to delivery, (2) terminate the entire pregnancy or, (3) selective feticide of the conjoined twins. (hindawi.com)
A review published in 2003 reported thirteen cases of conjoined twins within a triplet pregnancy [ 2 ]. (hindawi.com)

A pair of monozygotic male twins discordant for ectopia vesicae urinariae is described. (bmj.com)
Female-male twins: This is the most common pairing (50%), encompassing both "female-male" (25%) and "male-female" (25%) twins. (wikipedia.org)
However, males are also more susceptible than females to die in utero, and since the death rate in utero is higher for twins, it leads to female twins being more common than male twins. (wikipedia.org)

We performed an intrapair comparison in 27 monozygotic twin pairs, one of whom was taking third-generation OC, whereas the other was not using OC. (maastrichtuniversity.nl)

The donor twin is usually smaller and has oligohydramnios due to decreased urine production, whereas the recipient is larger with polyhydramnios due to polyuria. (medscape.com)
As the donor twin becomes hypovolemic, decreased renal perfusion causes decreased urine output and oligohydramnios . (medscape.com)

It was remarkable, therefore, to identify a MZ twin pair in which one sister had undergone menopause for unexplained reasons at age 14 years, whereas the other, aged 24, was still fertile with three naturally conceived children, as well as normal ovulatory cycles and ovarian reserve (Silber et al. (infertile.com)
We take a microgenetic approach to investigate the issue, illustrated by the analysis of an episode between a pair of male twin children and their grandpa. (bvsalud.org)
Whole-exome sequencing was performed for the twin pair that had discordance of aortic valve and aortic aneurysm. (elsevierpure.com)
Crossed cerebral lateralization for verbal and visuo-spatial function in a pair of handedness discordant monozygotic twins: MRI and fMRI brain imaging. (ox.ac.uk)
To examine the nature of hemispheric lateralization for neural processes underlying verbal fluency and visuo-spatial attention, we investigated a single pair of handedness discordant monozygotic (MzHd) twins. (ox.ac.uk)
We report on a pair of male monozygotic twins, one unaffected and the other affected with gonadotropin-releasing hormone (GnRH)-dependent precocious puberty, and discuss the role of treatment with a GnRH analog in the attainment of full height potential in GnRH-dependent precocious puberty. (elsevierpure.com)
To this end, we studied a pair of monozygotic female twins appearing discordant for dementia of the Alzheimer type (DAT). (jamanetwork.com)
An 81-year-old female monozygotic twin pair. (jamanetwork.com)
Fifty-six marijuana use discordant monozygotic twin pair members of the Vietnam Era Twin (VET) Registry. (erowid.org)

The twins' varied life histories suggest that environmental risk factors may contribute to apparent discordance for DAT and possible delay in disease onset for the currently nondemented twin. (jamanetwork.com)

Results indicated significantly higher levels of anxious and depressive symptomatology in twins with a motor disorder in discordant pairs compared to their co-twins without a motor disorder, and controls. (edu.au)
In comparison with their well co-twins, the affected twins, in discordant pairs, had developed fewer epidermal ridges in the a-b interdigital area of their right palms. (missouristate.edu)

Twins that split between days 0 and 3 have 2 amnions and 2 placentas (diamniotic dichorionic). (medscape.com)
Between days 4 and 7 the twins will share a placenta but will have separate amniotic sacs (diamniotic monochorionic). (medscape.com)
The 2 separate amniotic sacs of diamniotic twins are prominent in this image. (medscape.com)
This image of diamniotic monochorionic twins shows the dividing membrane and a single placenta. (medscape.com)
A thirty-two-year-old gravida 1 para 0 was referred to High Risk Obstetrics with a diagnosis of dichorionic diamniotic twin gestation. (hindawi.com)
An early ultrasound at six weeks gestation was reported as a dichorionic diamniotic twin gestation. (hindawi.com)

There has been no real doubt that human homologous or identical twins come from the division of a single egg. (edu.au)
Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. (wikipedia.org)
She couldn't tell the difference between the identical twins. (youdao.com)
N-COUNT Identical twins are twins of the same sex who look exactly the same. (youdao.com)
One of her most famous photographs is called " Identical Twins . (youdao.com)
But what if you are able to find identical twins who were separated at birth, and reared in radically different environments. (youdao.com)
It even distinguished between identical twins--their genes are the same, but their irises aren't. (youdao.com)
The developing embryo starts to split into identical twins within the first two weeks after conception. (youdao.com)
And it is only a predisposition towards having non-identical twins that is passed down through families. (youdao.com)
For example, I have used data on monozygotic (or 'identical') twins to analyze if the extent to which mothers read to children affect children's academic performance. (ku.dk)

DESIGN, SETTING, AND PARTICIPANTS: Two pairs of twins that were objectively determined to be monozygotic were examined at a tertiary care medical center associated with an academic medical center. (elsevierpure.com)

Using self-report measures of depressive symptoms and HRQL, we conducted univariate and bivariate sex-limitation twin analyses. (plos.org)
Roux-en-Y gastric bypass surgery progressively alters radiologic measures of hypothalamic inflammation in obese patients. (mpg.de)

however, once the death of one twin is identifed, immediate delivery of the surviving twin has not been shown to improve outcomes. (medscape.com)

Treg from asthmatic discordant twins demonstrated decreased FOXP3 protein expression and impaired Treg function that was associated with increased levels of CpG methylation within the FOXP3 locus when compared to their non-asthmatic twin partner. (nih.gov)
In parallel, Teff from discordant asthmatic twins demonstrated increased methylation of the IFNγ locus, decreased IFNγ expression and reduced Teff function when compared to Teff from the non-asthmatic twin. (nih.gov)

Between days 7 and 13 the twins will share both a placenta and an amniotic sac (monoamniotic monochorionic), and after day 13 the twins will be conjoined. (medscape.com)

METHODS: Ten MZ twin pairs requested ovarian transplantation and eight have undergone transplantation with cryopreservation of spare tissue. (infertile.com)
2005). After the sterile twin received a graft of ovarian tissue from her sibling, she conceived naturally during the second menstrual cycle, and delivered a healthy baby at full-term. (infertile.com)

Both monozygotic twins presented a chronic pain phenotype , although they were discordant with the TMD-related pain . (bvsalud.org)

Control- Twin did not show TMD, however she presented other chronic pains . (bvsalud.org)

The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. (wikipedia.org)
The Yoruba people have the highest rate of twinning in the world, at 45-50 twin sets (90-100 twins) per 1,000 live births, possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side. (wikipedia.org)
In Central Africa, there are 18-30 twin sets (or 36-60 twins) per 1,000 live births. (wikipedia.org)
only 6 to 9 twin sets per 1,000 live births. (wikipedia.org)
North America and Europe have intermediate rates of 9 to 16 twin sets per 1,000 live births. (wikipedia.org)
Multiple pregnancies are much less likely to carry to full term than single births, with twin pregnancies lasting on average 37 weeks, three weeks less than full term. (wikipedia.org)
Other factors that increase the odds of having fraternal twins include maternal age, fertility drugs and other fertility treatments, nutrition, and prior births. (wikipedia.org)
Among non-twin births, male singletons are slightly (about five percent) more common than female singletons. (wikipedia.org)

The first familial cases were reported in twins by Rosen and subsequently in 8 persons from a large 3-generation pedigree reported by Pipkin. (medscape.com)

Shared fetal heart of conjoined twins. (hindawi.com)
A repeat scan was performed four days later again confirming a viable singleton gestation with fetal demise of conjoined twins. (hindawi.com)

This case of discordant twins is not unique, however, and nine other twin pairs have subsequently consulted our center for ovarian transplantation in preference to conventional oocyte donation . (infertile.com)

Beside the present case, the only other illustrative specimens among mammals are the normal developmental stages of the Texas armadillo (Newman and Patterson, '10) and Assheton's ('98) single case of a sheep's blastodermic vesicle which bore twin germinal areas. (edu.au)
CASE REPORT TMD- Twin presented a diagnosis of painful (myofascial pain with referral ) and joint (disk displacement with reduction) TMD according to the criteria of the DC/TMD. (bvsalud.org)

Fraternal twins are, essentially, two ordinary siblings who happen to develop in the womb together and who are born at the same time, since they arise from two separate eggs fertilized by two separate sperm, just like ordinary siblings. (wikipedia.org)

Different neural and cognitive response to emotional faces in healthy monozygotic twins at risk of depression. (ox.ac.uk)
TMD- Twin was more exposed to painful procedures and emotional events due to congenital heart problems. (bvsalud.org)

Person-specific non-shared environmental influences on intra-individual variability of daily school feelings were estimated using time series data from twenty-one pairs of monozygotic twins (age = 10 years, 16 female pairs) over two consecutive weeks. (psu.edu)

Conclusions: Because the a-b ridges are known to complete development between 13 and 15 weeks estimated gestational age, the results provide physical evidence suggesting that the schizophrenia-affected monozygotic twins alone experienced a time-specific and time-limited dysgenesis during this time. (missouristate.edu)

From 16 weeks until delivery, monochorionic twin pregnancies should be screened for TTTS every 2 weeks. (medscape.com)

There is a dearth of studies examining monozygotic ASD discordant twins, and Lynnea explains why this group is so important for inclusion in research to advance the science into non-shared environmental effects, and explains the implications of the findings for professionals working in child and adolescent mental health. (acamh.org)
The design of research with monozygotic twins discordant for the disease has emerged as a powerful tool for the detection of phenotypic risk factors . (bvsalud.org)

Conjoined twins occur when division of a single zygote takes place twelve to thirteen days after fertilization [ 1 ]. (hindawi.com)

We examined whether sub-optimal intra-uterine growth relates to impaired cognitive outcome by comparing birthweight and cognition in monozygotic (MZ) twins. (uel.ac.uk)

Restricting analyses to MZ twins enables the effect of reduced intra-uterine growth on cognition to be examined independently of confounding factors including parental IQ and education, gender, age, genes, and gestation. (uel.ac.uk)

Analysis of an X linked DNA polymorphism in 16 independent somatic cell hybrids made between cells derived from each girl and a mouse line suggest that in one twin only the maternal X chromosome is active, whereas in the other the active X was paternally derived. (bmj.com)
The cultural psychology approach demands a qualitative, systemic analysis of complexities of twin development, considering the dynamics of internalization processes taking place within culture, and across social relations with significant adults. (bvsalud.org)
We combined the high-throughput of mass cytometry, facilitating the analysis of 57 twin pairs, with cellular indexing of transcriptomes and epitopes by sequencing (CITE-seq) of eight selected twin pairs to obtain a comprehensive overview of epitopes, transcriptome and T cell receptor (TCR) clonotypes. (nature.com)
Phenotypic analysis of discordant monozygotic twins for pain-related temporomandibular joint disorder. (bvsalud.org)

The co-twin control design was used to explore these mental health issues in MZ twins concordant and discordant for a motor disorder, and controls. (edu.au)
A monozygotic co-twin control design was used to compare the health of former heavy marijuana using male monozygotic twins to that of their co-twins who never used marijuana significantly. (erowid.org)

TMD- Twin showed reduced pressure pain threshold , hyperalgesia in trigeminal and extra-trigeminal regions compared to the Control- Twin . (bvsalud.org)
TMD- Twin presented an internal locus of control . (bvsalud.org)
The internal locus of control indicates greater pain sensitivity , with better coping of the painful experience for the TMD- Twin . (bvsalud.org)

This scan identified a triplet gestation complicated by a set of conjoined twins. (hindawi.com)

This is the most common type of twin. (wikipedia.org)

Using complementary multimodal high-throughput and high-dimensional single-cell technologies in conjunction with data-driven computational tools, we identified an inflammatory shift in a monocyte cluster of twins with MS, coupled with the emergence of a population of IL-2 hyper-responsive transitional naive helper T cells as MS-related immune alterations. (nature.com)
Moreover, review of previous reports of monozygotic twin pairs concordant or discordant for Alzheimer's disease, with adequate family history data, suggest a pattern indicating interactions among age at dementia onset, sex, and familiality. (jamanetwork.com)

The results suggest that the mean advantage for heavier twins relative to their lighter co-twins can be as much as half a SD in VIQ points. (uel.ac.uk)
RESULTS: High-risk twins showed increased neural response to happy and fearful faces in dorsal anterior cingulate cortex (ACC), dorsomedial prefrontal cortex (dmPFC), pre-supplementary motor area and occipito-parietal regions compared to low-risk twins. (ox.ac.uk)
As the sample is taken from the mother's blood, there's no way to isolate the results for each twin. (twinslist.org)

The first of the two new specimens} consisted of a single chorionic sac which contained twin embryos, each 12.3 mm. long (fig. 1). (edu.au)
Within the single chorion were twin embryos of 11.5 and 12 mm. (fig. 4). (edu.au)
Monozygotic twinning occurs when a single fertilized egg divides to form 2 embryos. (medscape.com)

Diseases5

Chemicals and Drugs1

Analytical, Diagnostic and Therapeutic Techniques and Equipment8

Psychiatry and Psychology1

Phenomena and Processes11

Disciplines and Occupations1

Anthropology, Education, Sociology and Social Phenomena1

Information Science1

Named Groups7

Health Care3

Dizygotic12

Complication of monozygotic2

Genetic14

Concordant for schizophrenia4

Differences7

Concordance1

Genetically5

Study18

Ovum1

Cohort1

Clinical4

Pregnancy9

Male twins3

Intrapair1

Donor2

Pair9

Discordance1

Discordant pairs2

Diamniotic6

Identical twins10

PARTICIPANTS1

MEASURES2

Outcomes1

Methylation2

Amniotic sac1

Tissue2

Phenotype1

Chronic1

Births8

Familial1

Fetal2

Transplantation1

Case2

Siblings1

Emotional2

Female1

Conclusions1

Pregnancies1

Research2

Zygote1

Cognitive1

Analyses1

Analysis4

Design2

Control3

Gestation1

Type1

Data2

RESULTS3

Single3