title: Acrosin activity and acrosome ultrastructure of human spermatozoa after freeze preservation.
mesh_terms: D000818:Animals; D005615:Freezing; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D010447:Peptide Hydrolases / Q000378:metabolism*; D011309:Preservation, Biological; D013094:Spermatozoa / Q000166:cytology / Q000201:enzymology*
chemical_list: D010447:Peptide Hydrolases