JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
High magnification light micrograph of a seminiferous tubule showing primary spermatocytes in meiosis (diplotene) and spermatids with rounded nuclei, many of which show a centriole, which appears as a small granule. Magnification: x360 when printed at 10 centimetres wide.
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