IL-17RC expression in the male reproductive system. Arrows: Sertoli cells (A and A') and epithelium (B, B', C, C', D, and D'); and open arrows: spermatogonia (A and A'). Original magnification: × 400. Figure D and D' were reproduced from a previous publication in Neoplasia, 9 (6): 464–470, 2007, with permission by Neoplasia Press and the author Z. You.