Fertilizing capacity of human spermatozoa evaluated by actual penetration of foreign eggs.
D000818:Animals; D006224:Cricetinae; D005260:Female; D005306:Fertilization; D006801:Humans; D007248:Infertility, Male; D008297:Male; D009865:Oocytes; D010063:Ovum; D013045:Species Specificity; D013094:Spermatozoa / Q000502:physiology* / Q000648:ultrastructure; D013997:Time Factors