title: Factors influencing the assay for target cells of Friend spleen focus-forming virus.
mesh_terms: D000818:Animals; D005622:Friend murine leukemia virus; D006412:Hematopoietic Stem Cells; D051379:Mice; D013045:Species Specificity; D013154:Spleen; D013997:Time Factors; D014412:Tumor Virus Infections; D010948:Viral Plaque Assay