title: [Biological activity of different zones obtained by ultracentrifugation of the milk factor of the strain PS strain mouse on preformed Ficoll gradients].
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002474:Cell-Free System; D002499:Centrifugation, Density Gradient; D003080:Cold Temperature; D003470:Culture Media; D066298:In Vitro Techniques; D007938:Leukemia / Q000209:etiology; D008321:Mammary Glands, Animal; D008324:Mammary Tumor Virus, Mouse / Q000472:pathogenicity*; D051379:Mice; D008892:Milk; D013045:Species Specificity; D014461:Ultracentrifugation
chemical_list: D003470:Culture Media
vernacular_title: Activité biologique des différents zones obtenues par ultracentrifugation du facteur lacté de la souche de souris PS sur gradients préformés de ficoll.