genetic mapping Mth1 Nudt1 http://identifiers.org/mgd/MGI:109280 8-oxo-7,8-dihydro-2'-dGTPase|Mth1 8-oxo-7,8-dihydro-2'-dGTPase protein coding gene Gene nudix (nucleoside diphosphate linked moiety X)-type motif 1 O MGI:109280 +