Twins, DizygoticTwins, MonozygoticDiseases in TwinsTwinsTwins, ConjoinedTwin Studies as TopicGenomeGenome, BacterialGenome, ViralPregnancy, TwinEnvironmentGenome, HumanGenome, PlantTripletsPregnancy, MultipleGenome, MitochondrialTwinning, MonozygoticModels, GeneticPregnancyGenome, FungalGene-Environment InteractionGenetics, BehavioralInheritance PatternsRegistriesGenome SizeSequence Analysis, DNAMaternal Serum Screening TestsPhenotypeFetofetal TransfusionGenome, ArchaealDenmarkGenetic VariationQuantitative Trait, HeritablePhylogenyGenetic Predisposition to DiseaseHeredityBirth WeightBase SequenceInfant, NewbornEvolution, MolecularGenome, InsectChimerismGenome, ProtozoanChorionSwedenGenomicsSocial EnvironmentSiblingsGenome, ChloroplastGenotypeChromosome MappingFinlandGenetic LinkageCohort StudiesRisk FactorsMaternal Age