MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Light micrograph of interstitial (Leydig) cells of a human testis. Leydig cells, involved in the secretion of male sex hormones, are the main cell type found in the connective tissue between seminiferous tubules (the area enclosed here by the blue-staining boundary). Leydig cells are large, with prominent nuclei (red) and abundant, pink-staining cytoplasm. They are located in association with lymph & blood vessels; one prominent blood vessel appears at top. Leydig cells secrete testosterone, the hormone responsible for secondary male sexual characteristics at puberty & the production of sperm. Magnification: x300 at 6x7cm size.
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