title: Evidence for the penetration of the vitelline membrane of the hen's ovum by a trypsin-like acrosomal enzyme.
mesh_terms: D000818:Animals; D002645:Chickens; D005260:Female; D005306:Fertilization; D008247:Lysosomes / Q000201:enzymology*; D008297:Male; D010063:Ovum; D013094:Spermatozoa / Q000201:enzymology*; D014357:Trypsin; D014361:Trypsin Inhibitors; D014817:Vitelline Membrane
chemical_list: D014361:Trypsin Inhibitors; D014357:Trypsin