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Sperm Morphology and Ultrastructure. A mature spermatozoon is a highly differentiated single cell that comprises head, midpiece and tail regions (Fig. 2A) all bounded。

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spermatozoon [sper″mah-to-zo´on] (pl. spermatozo´a) (Gr.) a mature male germ cell, the specific output of the testes,spermatozoide which fertilizes the mature ovum (secondary oocyte) in sexual。

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