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An electron micrograph of a section from the testis of a rat from group II showing two primary spermatocytes (SP) with heterochromatic nucleus (N) and the cytoplasm contains disrupted mitochondria (arrow) and many vacuoles (V). Note, the rupture of the nucleus (n) of early spermatid (SD) with appearance acrosomal cap (crossed arrow) (TEM × 2500).
