Nomenclature	Common abbreviation	HGNC, UniProt	Endogenous ligands
epidermal growth factor receptor	EGFR	EGFR, P00533	amphiregulin (AREG, AREGB, P15514), betacellulin (BTC, P35070), EGF (EGF, P01133), epigen (EPGN, Q6UW88), epiregulin (EREG, O14944), HB-EGF (HBEGF, Q99075), TGFα (TGFA, P01135)
v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 3	HER3	ERBB3, P21860	NRG-1 (NRG1, Q02297), NRG-2 (NRG2, O14511)
v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 4	HER4	ERBB4, Q15303	betacellulin (BTC, P35070), epiregulin (EREG, O14944), HB-EGF (HBEGF, Q99075), NRG-1 (NRG1, Q02297), NRG-2 (NRG2, O14511), NRG-3 (NRG3, P56975), NRG-4 (NRG4, Q8WWG1)