HNRNPC and infertility disorder: To determine the cause of sterility in hnRNPC cKO males, we conducted histological analyses and found that pachytene‐like spermatocytes were the most advanced spermatogenic cells in hnRNPC cKO adult testes, and no mature spermatozoa were observed in hnRNPC cKO cauda epididymis (Figure2A).