sentences:  The SV "gag" is not processed like the orthoretrovieral "gag"; only a tiny 3kDa cut at the C-terminal is requried, and other cleavage sites are generally inefficient.The Metaviral (MV, Ty3/gypsy) "gag", too, is known to have a structurally homologous capsid protein.Each capsid is assembled from 540 proteins.