each zona pellucida was challenged sequentially with two populations of sperm . an inverse relationship was found between the number of spermatozoa adherent to the zona and the proportion of sperm exhibiting binding of iga or igg immunoglobulins over the head , indicating that the presence of these antibodies in the acrosomal region of the sperm head inhibited their ability to attach to the zona pellucida .
C0037868
sperm
C0037844
the