Source:http://linkedlifedata.com/resource/umls/id/C0017278
MSH: Retroviral proteins, often glycosylated, coded by the envelope (env) gene. They are usually synthesized as protein precursors (POLYPROTEINS) and later cleaved into the final viral envelope glycoproteins by a viral protease.,NCI: Proteins that comprise the membrane or envelope that encapsulates a virus. These proteins often require proteolytic cleavage for functional activity.