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The hedgehog signaling pathway is a mechanism that regulates cell growth and differentiation during embryonic development, called embryogenesis, in…
Drosophila melanogasterCyclopiaGenetic regulationZebra danioGenesConrad Hal Waddington's Organisers and Genes, published in 1940, is a summary of available research and theoretical framework for many concepts…
LiteratureOrganizers, EmbryonicPublicationsdifferentiationIn his 1907 paper, "Experiments in Transplanting Limbs and Their Bearing Upon the Problems of the Development of Nerves," in the Journal of…
TransplantationExperimentsFrogsAmphibiansIn "Versuche zur Analyse der Induktionsmittel in der Embryonalentwicklung," published in Naturwissenschaften in 1932, Hermann Bautzmann, Johannes…
Organizers, EmbryonicExperimentsTransplantationStephen Jay Gould studied snail fossils and worked at Harvard University in Cambridge, Massachusetts during the latter half of the twentieth century…
Punctuated equilibrium (Evolution)Spandrel beamsOntogenyPhylogenyFossilsFrederik Ruysch's cabinet of curiosities, commonly referred to simply as the Cabinet, was a museum Ruysch created in the Netherlands in the late…
OrganizationHuman AnatomyAnatomical museumsHuman anatomy--HistoryTissues--PreservationAfter becoming chief pathologist at the University of Wisconsin-Madison Wisconsin Regional Primate Center in 1995, James A. Thomson began his…
Stem CellsExperimentsPublicationsHuman DevelopmentAfter becoming chief pathologist at the University of Wisconsin-Madison Wisconsin Regional Primate Center in 1995, James A. Thomson began his…
Stem CellsExperimentsPublicationsHuman DevelopmentParasitic twins, a specific type of conjoined twins, occurs when one twin ceases development during gestation and becomes vestigial to the fully…
Twins, ConjoinedReproductionFetusCongenital DisordersHuman DevelopmentCellular automata (CA) are mathematical models used to simulate complex systems or processes. In several fields, including biology, physics, and…
Von Neumann, John, 1903-1957ModelsEvolution