the 35s rna of all replication competent helper viruses is divided into three genes encoding the viral structural proteins : the gag ( group-specific antigen ) gene codes for the internal structural proteins , the pol ( polymerase ) gene codes for the enzymes protease , reverse transcriptase and endonuclease and the env ( envelope ) gene codes for the proteins of the viral envelope .
C0042738
viral structural proteins
C0042711
proteins