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Figure 3   A single sperm penetrating an egg. From Hermann Fol, "Recherches sur la condation et le commencement de l'hnognie chez divers animaux," Mem. Soc. Phys. Hist. Nat. Genve 26 (1879) . Reproduced by permission of the Museum of Comparative Zoology, Harvard University.
Figure 3
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