electron microscope studies of eight different sublines of ehrlich ascites tumor cells which had not , as far as could be determined , come in contact with any known virus , revealed dense particles measuring approximately 55 to 70 mmicro in diameter , both within and attached to the wall of cytoplasmic vesicles identified as the endoplasmic reticulum .
C0007634
cells
C0014239
endoplasmic reticulum