title: Preparations enriched for "immature" murine leukemia virus particles that remain in tissue culture fluids are deficient in Pr65gag proteolyic activity.
mesh_terms: D002499:Centrifugation, Density Gradient; D008979:Moloney murine leukemia virus / Q000032:analysis / Q000201:enzymology* / Q000648:ultrastructure; D010447:Peptide Hydrolases / Q000378:metabolism*; D012367:RNA, Viral / Q000032:analysis; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism; D011925:Rauscher Virus / Q000032:analysis / Q000201:enzymology* / Q000648:ultrastructure; D014764:Viral Proteins / Q000378:metabolism; D014771:Virion / Q000201:enzymology*
chemical_list: D012367:RNA, Viral; D014764:Viral Proteins; D012194:RNA-Directed DNA Polymerase; D010447:Peptide Hydrolases