title: Hatching in the toad Xenopus laevis: morphological events and evidence for a hatching enzyme.
mesh_terms: D000626:Aminopeptidases / Q000378:metabolism*; D000818:Animals; D003470:Culture Media; D004625:Embryo, Nonmammalian / Q000201:enzymology; D005306:Fertilization; D007814:Larva / Q000254:growth & development; D010447:Peptide Hydrolases / Q000378:metabolism*; D010784:Photomicrography; D013997:Time Factors; D014981:Xenopus / Q000196:embryology* / Q000378:metabolism
chemical_list: D003470:Culture Media; D010447:Peptide Hydrolases; D000626:Aminopeptidases