MGI:2386848 b5/b5r genetic mapping protein coding gene B5+B5R Cyb5r4 2810034J18Rik Ncb5or http://identifiers.org/mgd/MGI:2386848 + Gene O b5/b5r|B5+B5R|Ncb5or|2810034J18Rik cytochrome b5 reductase 4