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(a) Sections of seminiferous tubules of busulfan treated rat. The seminiferous tubules were empty and without germinal layer cells indicating the absence of spermatogenesis. (b) Sections of seminiferous tubules of treated rat with adipose tissue-derived mesenchymal stem cells. Most of tubules appeared to be filled with spermatogenic cells up. Some seminiferous tubules were not treated (arrow). White line indices are equal to 10 μm. H and E
