Preparations enriched for “immature” murine leukemia virus particles that remain in tissue culture fluids are deficient in Pr65gag proteolytic activity
1. Department of Microbiology, Mie University School of Medicine, 174 Edobashi-2-Chome, Tsu, Mie, Japan 514;2. Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts 01545, USA