Figure 5. (A–D) Immunohistochemical analysis of adult testis sections with TEX14 antibody. (A) TEX14 is expressed in human testis cross-sections in obstructive azoospermia tissue samples. TEX14 is expressed specifically by germ cells at varying stages of spermatogenesis. Type A spermatogonia (SA), primary spermatocytes (S1) and early round spermatids (S3) stain positively for TEX14. (B) TEX14 is expressed in human testis cross-sections in MA tissue samples. (C) Negative control of testis cross-sections in MA tissue samples. (D) No positive signal is detected in adult human testis of SCOS tissue samples. The scale bar represents 10µm.