MATRIX (M) PROTEIN REQUIREMENT FOR THE BINDING OF VESICULAR STOMATITIS VIRUS RIBONUCLEOCAPSID TO SONICATED PHOSPHOLIPID VESICLES11This work was supported by PHS grant AI-1112 from the NIAID, grant MV-9E from the ACS and grant PCM-88-00494 from the NSF. JRO is a postdoctoral trainee supported by PHS Training Grant CA-9109 from the NCI.