title: A cytostatic factor in amphibian oocytes: its extraction and partial characterization.
mesh_terms: D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002499:Centrifugation, Density Gradient; D003593:Cytoplasm / Q000032:analysis; D003956:Dialysis; D005260:Female; D005306:Fertilization; D006868:Hydrolysis; D008938:Mitosis / Q000187:drug effects*; D010063:Ovum / Q000032:analysis*; D010447:Peptide Hydrolases / Q000494:pharmacology; D011188:Potassium / Q000494:pharmacology; D011894:Rana pipiens; D012964:Sodium / Q000494:pharmacology; D014357:Trypsin / Q000494:pharmacology
chemical_list: D012964:Sodium; D010447:Peptide Hydrolases; D014357:Trypsin; D011188:Potassium; D002118:Calcium