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Immunohistological staining for detected TNP2. TNP2, Bright spots in periphery of the central lumen (arrows), detected in section A. Section A, samples that received melatonin and spermatogonial stem cells transplantation, simultaneously. Section B shows the negative control group. Section C, samples that received placebo and spermatogonial stem cells transplantation. TNP2 was not detected in the section C. Magnification X 400
