Spermatogenesis, light micrograph
Light micrograph of a seminiferous tubule. The germinal epithelium shows spermatogonia, Sertoli cells (with large nucleoli), primary spermatocytes, immature spermatids (with acrosomal granules), residual bodies and mature spermatozoa. Semithin resin section 0.5 micrometres thick stained with toluidine blue., Photo by JOSE CALVO / SCIENCE PHOTO LIBRARY
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