FIGURE 20.27 ■ Smear of human semen illustrating the appearance of mature
sperm with covering acrosome caps. Stain: hematoxylin and eosin. ×320.
FIGURE 20.28 ■ Transverse section of a canine ductus deferens with the
surrounding muscle layers and adventitia. Stain: hematoxylin and eosin. ×20.
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