• Here we provide step-by-step instructions to generate parabiotic zebrafish embryos by surgical fusion of developing blastulas. (jove.com)
  • To determine the role of transcription in euchromatin organization, we used zebrafish embryos at the late blastula (sphere) stage. (nature.com)
  • Peter, I. S. & Davidson, E. H. The endoderm gene regulatory network in sea urchin embryos up to mid-blastula stage. (nature.com)
  • Animal embryos often do this after fertilization (in the blastula stage) to make many small cells from the large fertilized egg. (physicsforums.com)
  • This time corresponded to the late-blastula period. (bioone.org)
  • The morula develops into a structure called a blastula through a process called blastulation. (wikipedia.org)
  • After the 7th cleavage has produced 128 cells, the morula becomes a blastula. (wikipedia.org)
  • With the establishment of the blastocoele the embryo is said to have progressed from the morula to the blastula stage. (edu.au)
  • The structure of the bird embryo in these stages may be brought in line with the morula and blastula stages of forms having little yolk if the full significance of the great yolk mass is appreciated. (edu.au)
  • Instead of being free to aggregate first into a solid sphere of cells (morula) and then into a hollow sphere of cells (blastula), as takes place in forms with httle yolk, the blastomeres in the bird embryo are forced to grow on the surface of a large yolk sphere. (edu.au)
  • The different cells derived from cleavage, up to the blastula stage, are called blastomeres. (wikipedia.org)
  • Animals are generally considered to be multicellular organisms that are capable of locomotion in response to their environment (motile), are required to ingest or eat and swallow other organisms to gain proper nutrition (heterotropic), contain within each cell genetic material organized as two sets of chromosomes within a membrane-bound nucleus ( eukaryotic ), develop through a blastula (hollow ball) stage, and integrate muscle tissue, nervous tissue, and collagen into their body. (newworldencyclopedia.org)
  • We are addressing the movements in a blastula, at an early developmental stage. (evolutionnews.org)
  • Xwnt-8 is expressed by mid-blastula stage, in ventral and lateral mesoderm. (embl-heidelberg.de)
  • The prevailing theory is that the malformation occurs soon after the blastula stage of development. (contemporarypediatrics.com)
  • Transplantation of living nuclei from blastula cells into enucleated frogs' eggs. (springer.com)
  • Face views are shown during cleavage and blastula stages. (ucsd.edu)
  • There are at least four stages through which the pluripotent cells of epiblast or blastula become neuroblasts. (mcw.edu)
  • Almost as soon as it is established there begins a rearrangement of the cells presaging the formation of the blastula. (edu.au)
  • The morula develops into a structure called a blastula through a process called blastulation. (wikipedia.org)
  • After the 7th cleavage has produced 128 cells, the morula becomes a blastula. (wikipedia.org)
  • Biogenetic law of Ernst Haeckel assumed a parallelism between ontogeny and phylogeny, and asserted that embryogenesis is a recapitulation of ancient organisms because all animals start their existence from a one-celled stage and develop into morula, blastula and then gastrula stages 2 , 3 . (nature.com)
  • For example, we still do not know how to explain the common early embryonic stages, such as the morula, blastula and gastrula, in evolutionary terms. (nature.com)
  • Their argument is that every zygote, blastula, morula, and fetus is a child, so each one saved -- every marginal improvement, as it were -- is important in its own right. (dorfonlaw.org)
  • Some embryos were also analyzed at blastula stage 9. (xenbase.org)
  • The eggs continued to grow into three-day-old embryos, which scientists refer to as blastulas. (zmescience.com)
  • This DNA, referred to as oDNA, was reacted with excess polysomal mRNA from sea urchin embryos at 16-cell, blastula, and gastrula stages. (caltech.edu)
  • This selected DNA, termed null oDNA, was reacted with excess polysomal mRNA from 16-cell, blastula and gastrula embryos. (caltech.edu)
  • Thus, a significant number of new, non-maternal structural genes are expressed in blastula stage embryos. (caltech.edu)
  • The different cells derived from cleavage, up to the blastula stage, are called blastomeres. (wikipedia.org)
  • The blastula is formed through multiple rounds of cell division (cleavage) of the fertilized egg. (edu.in)
  • Students will learn the discrete stages of cleavage which leads to the formation of the blastula. (edu.in)
  • Over several hours, cleavage eventually creates a hollow ball of cells called a blastula. (pearson.com)
  • Face views are shown during cleavage and blastula stages. (ucsd.edu)
  • The blastula stage is crucial in embryonic development, as it marks the transition from a single-cell zygote to a multicellular embryo. (edu.in)
  • The embryo undergoes gastrulation, a process in which cells within the blastula rearrange and differentiate into the three primary germ layers: ectoderm, mesoderm, and endoderm. (edu.in)
  • These nonmaternal mRNAs are complex class sequences present on blastula polysomes at about the same concentration (500 copies per embryo) as are most maternal sequence mRNAs. (caltech.edu)
  • The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form the blastula. (edu.in)
  • However, in Xenopus blastula, chromatin tethering to the NE depends on nuclear filamentous actin that develops in a blastula-specific manner. (nih.gov)
  • To investigate whether chromatin tethering operates in the blastula through INMPs, we experimentally introduced INMPs into Xenopus egg extracts that recapitulate nuclear formation in fertilized eggs. (nih.gov)
  • We subsequently found that the LBR level was very low in the Xenopus blastula but was elevated after the blastula stage. (nih.gov)
  • These results suggest that LBR-mediated chromatin tethering is circumvented in the Xenopus blastula, as it is detrimental to embryonic development. (nih.gov)
  • Dorsal induction from dorsal vegetal cells in Xenopus occurs after mid-blastula transition. (wikigenes.org)
  • 2. Epigenetic complexity during the zebrafish mid-blastula transition. (nih.gov)
  • Downregulation of Cdc25 activity at the Drosophila mid-blastula transition is critical in order to remodel cell cycle progression. (nih.gov)
  • We showed that Cdk1 downregulation at the mid-blastula transition (through the downregulation of Cdc25) is responsible for dramatically lengthening S-phase. (nih.gov)
  • Total cytoplasmic RNA was extracted from 16-cell, blastula, prism and pluteus stages and reacted in excess with (3)H-oDNA. (caltech.edu)
  • Hybridization levels observed with cytoplasmic RNAs from later stages were progressively less, but were higher than the corresponding mRNA hybridization levels through the blastula stage. (caltech.edu)
  • When the LBR level was precociously elevated in the blastula by injecting LBR mRNA, it induced alterations in nuclear lamina architecture and nuclear morphology and caused DNA damage and abnormal mitotic spindles, depending on the N2-3 domains. (nih.gov)
  • Blastula and gastrula stage mRNA reacted with oDNA to about 56% and 53%, respectively, representing 2.1 x 10(7) and 1.9 x 10(7) nucleotides of oocyte RNA sequence. (caltech.edu)
  • Mesenchyme blastula mRNA, however, hybridized about 3.6 x 10(6) nucleotides of null-oDNA sequence which is sufficient to code for approximately 2,000 mRNAs of average size. (caltech.edu)
  • A maximum of 16% of the blastula sequences are present in coelomocyte and intestine messenger RNAs while 40% of the blastula sequences are represented in gastrula mRNA. (caltech.edu)
  • We conclude from this result that virtually all of the blastula mRNA sequences are transcribed in three heterologous tissues in which the transcripts are not utilized as messenger RNAs. (caltech.edu)
  • Only some of the early dorsal β-catenin signature genes were activated at blastula whereas others required the induction of endomesoderm , as indicated by their inhibition by Cerberus overexpression. (xenbase.org)
  • A blastula resembles a hollow ball with the layer of cells surrounding a fluid-filled cavity (blastocele). (wakehealth.edu)
  • As a result, a hollow ball of cells called the blastula is formed. (edu.in)
  • With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. (yahoo.com)
  • The blastula typically consists of a single layer of cells, known as the blastoderm or blastodisc, surrounding a central fluid-filled cavity called the blastocoel. (edu.in)
  • The cells on the outside of the blastula are referred to as the outer or surface cells, while those lining the blastocoel are called the inner or embryonic cells. (edu.in)
  • The cavity inside the blastula is called the blastocoel. (pearson.com)
  • You're An Arse In the first few weeks after fertilisation, you're nothing more than a small group of cells called a "blastula" that bursts open from the inside out, making a little bitty opening. (dollarshaveclub.com)
  • Students can understand the concept of the formation of blastula. (edu.in)
  • This was probably because of migration of energids and formation of the blastula. (bioone.org)
  • The ingrowth and curling inward of a group of cells, as in the formation of a gastrula from a blastula. (wordsmith.org)
  • The kinetics of hybridization show that the blastula structural gene sequences are present in each nuclear RNA at about the same concentration as are the majority of the complex single copy nuclear transcripts. (caltech.edu)
  • This graph shows the total number of publications written about "Blastula" by people in this website by year, and whether "Blastula" was a major or minor topic of these publications. (wakehealth.edu)