title: Protease released from sea urchin eggs at fertilization alters the vitelline layer and aids in preventing polyspermy.
mesh_terms: D001665:Binding Sites; D004229:Dithiothreitol / Q000494:pharmacology; D005260:Female; D005306:Fertilization; D007314:Insemination / Q000187:drug effects; D008855:Microscopy, Electron, Scanning; D010063:Ovum / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D010447:Peptide Hydrolases / Q000378:metabolism* / Q000502:physiology; D011480:Protease Inhibitors; D012617:Sea Urchins; D013025:Glycine max; D014357:Trypsin / Q000494:pharmacology; D014361:Trypsin Inhibitors / Q000494:pharmacology
chemical_list: D011480:Protease Inhibitors; D014361:Trypsin Inhibitors; D010447:Peptide Hydrolases; D014357:Trypsin; D004229:Dithiothreitol