title: Biophysical and bioassay studies on milk fractions of genetically similar agent-bearing agent-free mouse substrains.
mesh_terms: D000818:Animals; D001681:Biological Assay; D003720:Densitometry; D005260:Female; D008324:Mammary Tumor Virus, Mouse / Q000032:analysis* / Q000166:cytology; D051379:Mice; D008854:Microscopy, Electron; D008892:Milk / Q000032:analysis*