Retroviral envelope proteins mediate receptor recognition and membrane fusion during early infection. Endogenous envelope proteins may have kept, lost or modified their original function during evolution. Ortholog of the human HERV-F(c)1_Xq21.33 envelope protein. Belongs to the gamma type-C retroviral envelope protein family. HERV class-I F(c)1 env subfamily. Could be the product of a pseudogene. Truncated; premature stop codon.