A-F, Immunofluorescence detection of SOX9 and FOXL2 proteins in adult testes. Conditional deletion of Dmrt1 with one copy of Rara using Sf1-Cre caused strong transdifferentiation (A), whereas deletion of Dmrt1 and both alleles of Rara with Sf1-Cre strongly suppressed transdifferentiation (B), indicating that Rara is required. By contrast, deletion of Dmrt1 alone or with Rarb using Sf1-Cre (C,D) or deletion of Dmrt1 with one (C) or both (D) alleles of Rarg using Dhh-Cre caused transdifferentiation, indicating that Rarb and Rarg are not required for transdifferentiation of Dmrt1 mutant Sertoli cells. Scale bars, 80 µm.