title: Contraceptive tetrapeptide in hamster embryos.
mesh_terms: D000818:Animals; D003270:Contraceptive Agents / Q000032:analysis*; D006224:Cricetinae; D004622:Embryo, Mammalian / Q000032:analysis*; D005260:Female; D010060:Ovulation / Q000187:drug effects; D010455:Peptides / Q000032:analysis* / Q000494:pharmacology
chemical_list: D003270:Contraceptive Agents; D010455:Peptides