title: Biological properties of B particles from C3H and C3Hf mouse milk.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D005260:Female; D008325:Mammary Neoplasms, Experimental / Q000453:epidemiology / Q000209:etiology*; D008324:Mammary Tumor Virus, Mouse / Q000302:isolation & purification*; D051379:Mice; D008892:Milk / Q000032:analysis*