Acrosin is a proteinase required for mammalian fertilization, and in freshly ejaculated spermatozoa exists as an inactive zymogen, proacrosin. A factor prsent in uterine flushings of gilts stimulates the conversion of highly pruified boar proacrosin to acrosin. Characterization of this factor indicates that its active component is a glycosaminoglycan.
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Wincek et al. (1979) studied this question.
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