We next investigated whether genes with strain-specific variants (Kit), involvement with steroid hormone production (Star, Cyp19a, Cyp17a1), association with PCOS (INHBB, Fem1b, Pgr, Androgen receptor, LHcgr), or involvement with gluconeogenesis or insulin signaling (Liver PepCk1, Liver IRβ, ovary IRβ, Liver G6Pase) might be involved in phenotypic differences. This evidence concerns the gene PGR and polycystic ovary syndrome.