avian erythroblastic leukemia viral (v-erb-b) oncogene homolog MGI:95294 Erbb Gene Egfr http://identifiers.org/mgd/MGI:95294 protein coding gene Errb1|avian erythroblastic leukemia viral (v-erb-b) oncogene homolog|9030024J15Rik|Wa5|Erbb + O Wa5 9030024J15Rik Errb1 epidermal growth factor receptor genetic mapping