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Bisphenol A (BPA) is an organic compound that was first synthesized by Aleksandr Dianin, a Russian chemist from St. Petersburg, in 1891. The chemical…
bisphenol AReproductionHormonesHuman DevelopmentResearchers Geoffrey Sher and Jeffrey Fisch gave Viagra, also known as sildenafil, to women undergoing fertility treatment to test whether the…
Fertility clinicsFertility, HumanHuman embryo--TransplantationEmbryo TransferSildenafil CitrateEtienne Geoffroy Saint-Hilaire, commonly known as Geoffroy, studied animals, their anatomy and their embryos, and teratogens at the National Museum…
Geoffroy Saint-Hilaire, Etienne, 1772-1844TeratologyZoologyFrench RevolutionHomology theoryThe Y-chromosome is one of a pair of chromosomes that determine the genetic sex of individuals in mammals, some insects, and some plants. In the…
Y ChromosomeSex ChromosomesEmbryosDNAChromosomesThe embryological treatise De formatione ovi et pulli (On the Formation of the Egg and of the Chick) was written by anatomist and embryologist…
LiteraturePublicationsOvaAnatomyJohannes Holtfreter made important discoveries about the properties of the organizer discovered by Hans Spemann. Although he spent much time away…
Organizers, EmbryonicBiographyFrogsGeorge Herbert Hitchings researched and developed medications that targeted specific parts of DNA replication processes to treat cancers and various…
Nucleoside analogDNA ReplicationDrug DevelopmentAcyclovirPharmacologyJacques Loeb developed procedures to make embryos from unfertilized sea urchin eggs in 1899. Loeb called the procedures "artificial parthenogenesis…
ParthenogenesisExperimentsSea UrchinsNerve growth factor (NGF) is a signaling protein and growth factor implicated in a wide range of development and maintenance functions. NGF was…
Nerve Growth FactorChicksNational Geographic's documentary In the Womb: Identical Twins focuses on the prenatal development of human identical twins. Director Lorne Townend…
LiteratureTwinsDocumentary filmsTestosteroneMethylation