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CIAŻA
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HIALURONIDAZA
3β-HSD
Rola P 4 :
Chemoatrakcja plemników, stymulowanie
reakcji akrosomowej plemnika i regulowanie
tempa przesuwania się zarodka do dalszych
części jajowodu.
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Figure 21–34 How the cortical reaction
in a mouse egg is thought to prevent
additional sperm from entering the egg.
The released contents of the
cortical granules inactivate ZP3 so it can
no longer bind to the sperm plasma
membrane. They also partly cleave ZP2,
hardening the zona pellucida so that
sperm cannot penetrate it. Together,
these changes provide a block to
polyspermy
Figure 21–33 The acrosome reaction
that occurs when a mammalian sperm
fertilizes an egg. In mice, the zona
pellucida is about 6 mm thick, and sperm
tunnel through it at a rate of about
1 mm/min.
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