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Figure 1: Histological organization of the seminiferous tubules. The figure shows two microscope images of rat testis: (a) low magnification picture of one seminiferous tubule and seminiferous epithelium containing Sertoli and germ cells at different stages of differentiation. Bar 100 μm; (b) a seminiferous tubule section indicating germ cells at different stages of differentiation. Bar 25 μm.