The p polymorphism has been introduced into ref(2)P+++.O1.cCMa. The p polymorphism consists of amino acid residue I32 being replaced by a V residue.
ref(2)P+p+.O1.cCMa is permissive for sigma virus multiplication.
ref(2)Pod3/Df(2L)E55 males carrying ref(2)P+p+.O1.cCMa are fertile.