title: Polymorphism of endogenous murine leukemia viruses revealed by isoelectric focusing in polyacrylamide gels.
mesh_terms: D007525:Isoelectric Focusing; D007526:Isoelectric Point; D009052:Leukemia Virus, Murine / Q000032:analysis*; D014764:Viral Proteins / Q000032:analysis*
chemical_list: D014764:Viral Proteins