title: The evaluation of AKR leukemia virus purity: the requirement for both velocity and isopycnic centrifugation methods.
mesh_terms: D000406:AKR murine leukemia virus / Q000302:isolation & purification* / Q000648:ultrastructure; D002499:Centrifugation, Density Gradient / Q000379:methods; D005069:Evaluation Studies as Topic; D009052:Leukemia Virus, Murine / Q000302:isolation & purification*; D008854:Microscopy, Electron; D014461:Ultracentrifugation / Q000379:methods