About ontogenins' role in embryonic development of animals.
D000818:Animals; D005075:Biological Evolution; D002454:Cell Differentiation / Q000187:drug effects*; D004625:Embryo, Nonmammalian; D014020:Tissue Extracts / Q000494:pharmacology*; D014319:Triturus / Q000196:embryology* / Q000254:growth & development
D014020:Tissue Extracts