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After ovulation, most mammalian ova are surrounded by follicle cells of the cumulus oophorus, therefore the spermatozoon, while penetrating the fetal membrane, are difficult to recognize.
International Science Film Collection, Audio Visual Services, Pennsylvania State University, 201 Carnegie Building, 1127 Fox Hill Rd., University Park, PA 16802, Toll-free: 800-826-0132, URL: http://www.psu.edu
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Running time 14 minutes.
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