Fig. 8. High power TEM of the cytoplasm of a stage 1b embryo in vitro, 24 hours post-insemination (original magnification x22,250). Shown is a longitudinal section through a wavy part of the fertilizing sperm flagellum containing the axial filament complex (AFC).

(From: Soupart and Strong, 1974. Reproduced with permission of the American Society for Reproductive Medicine.)

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