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This sense, this glycoprotein should belong to the energy factor. Injection of the sperm surface is attached to the epididymis and seminal vesicles secrete a factor to be able to. Acquisition process shall be removed so the surface of sperm fertilization ability of this factor and get the process, which will enable the sperm membrane structure and function of dramatic
Change. Factors to be able to rely mainly on the removal of the cervix, uterus and fallopian tubes fluid  amylase, trypsin,  glucosidase enzyme sialidase, which in the follicular fluid levels are high. Therefore, direct from epididymal sperm does not have fertilization ability, and these sperm on the female reproductive tract for some time, then removed for in vitro fertilization experiment,

Sperm in the epididymis course of the campaign to increase the surface negative charge, which can store sperm in the epididymis, due to charge repulsion of the role of the same sex, which is not integrated mission condensate. It should also be noted that some of epididymal secretions on the sperm surface coverage, which has a sialic acid containing glycoprotein.
There are indications that the transfer to the sperm surface sialic acid has important physiological functions: (1) is a sialic acid containing carboxyl sugar, with a negative charge, so the surface of sperm maturation in the main load to increase, that is, the increase in sialic acid. (2) from the immunology point of view, sialic acid has covered the function
Of spermspecific antigen, which makes the sperm maturation and in the long run the process to warrant the recognition by the immune activity of cells causing autoimmunity. Congenital sialyltransferase sialidase lacking or because the role of bacteria, can lead to immune infertility. (3) containing sialic acid glycoprotein is stable anterior acrosome membrane, and thus inhibit the sperm acrosome reaction. In