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(a) Sections of seminiferous tubule of treated rat with adipose tissue-derived mesenchymal stem cells (AT-MSCs). L: Lumen; Sc: Spermatogonia; S1: Spermatocytes; St: Spermatid and Sp: Spermatozoa. (b) Sections of seminiferous tubule of busulfan treated rat which is not transplanted with AT-MSCs, demonstrate empty seminiferous tubules that indicate no spermatogenic activity. L: Lumen and Se: Sertoli cell. White line indices are equal to 50 μm. H and E staining
