some unusual findings of the murine mammary tumor virus ( mumtv ) are described in cells of balb/cfc3h mice mammary tumors : ( 1 ) a conspicuous endocellular production of b particles by budding of a particles into small and large cytoplasmic vacuoles , into intracytoplasmic lumina , and possibly into vacuoles of secretion ;
C0007634
cells
C0042219
vacuoles