previously , we identified two mature glycoproteins , gp90 , the surface glycoprotein , and gp20 , the transmembrane protein , from avian reticuloendotheliosis virus and an avian reticuloendotheliosis virus env gene-encoded intracellular polyprotein gpr77env , but the precise relationship of gpr77env to the mature envelope proteins was not determined ( w.-p .
C0017968
glycoproteins
C0025248
surface