protein coding gene O genetic mapping MGI:1920036 2810481F14Rik http://identifiers.org/mgd/MGI:1920036 E430034L06Rik + 4921509N21Rik Tdp1 Gene E430034L06Rik|SCAN1|4921509N21Rik|2810481F14Rik SCAN1 tyrosyl-DNA phosphodiesterase 1