reproductive system
• although sperm from homozygotes are able to penetrate oocytes, they exhibit a delay in penetration of the zona pellucida in IVF assays
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• sperm from homozygous mice show a reduced in vitro fertilization rate of wild-type DMSO or aroclor-1254 treated (to harden the zona pellucida) oocytes, aged oocytes, and oocytes from backgrounds with a thick zona pellucida
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