Rfv3 Gm20117 http://identifiers.org/mgd/MGI:1933111 genetic mapping Rfv3|CEM15|Gm20117|Rfv-3 MGI:1933111 Apobec3 + protein coding gene CEM15 Gene O Rfv-3 apolipoprotein B mRNA editing enzyme, catalytic polypeptide 3