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Human Parainfluenza virus type 3 (HPIV3) belongs to the Paramyxoviridae family.Its three internal viral proteins,the nucleoprotein (N),the phosphoprotein (P),and the polymerase (L),form the ribonucleoprotein (RNP) complex,which encapsidates the viral genome and associates with M protein for virion assembly.We previously showed that the M protein expressed alone is sufficient to assemble and release virus-like particles (VLPs),and a point mutant of M protein,ML305A,has a VLP formation ability similar to that of wild-type M protein.