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Figure 1


Fig. 1. Spermatogonial stem cell location and divisions. Schematic of a magnified cross-section through a mouse seminiferous tubule, showing the basal membrane of the seminiferous tubule and the position of spermatogonia in relation to this membrane. The spermatogonial stem cells (As spermatogonia) are in a similar position to the other spermatogonia, on the basal membrane and surrounded by Sertoli cells. Also shown are primary spermatocytes, Sertoli cells and, more towards the lumen of the tubule, round spermatids. Nearest the lumen are elongated spermatids that will soon be shed into the lumen as spermatozoa. Modified with permission from Gilbert et al. (Gilbert et al., 2003).





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