title: New aspects of contraception by enzyme-directed antibodies.
mesh_terms: D000176:Acrosin / Q000276:immunology; D000818:Animals; D003267:Contraception; D003269:Contraception, Immunologic; D004798:Enzymes / Q000276:immunology*; D005260:Female; D006821:Hyaluronoglucosaminidase / Q000276:immunology; D008297:Male; D012756:Sheep; D013094:Spermatozoa / Q000201:enzymology*
chemical_list: D004798:Enzymes; D006821:Hyaluronoglucosaminidase; D000176:Acrosin