Type B particles in human milk.
D001943:Breast Neoplasms / Q000209:etiology / Q000473:pathology; D005260:Female; D006801:Humans; D008324:Mammary Tumor Virus, Mouse / Q000302:isolation & purification*; D008854:Microscopy, Electron; D008895:Milk, Human / Q000382:microbiology*; D013194:Staining and Labeling