Peritoneal Macrophage Is the Cell Transformed by Yoshida Ascites Tumor Virus

Resident peritoneal macrophages purified by adhesion on plastic surface, suspended in 1 ml of cell-free fluid from Yoshida ascites tumor for 2 h, washed three times and reinjected in the original rat, produce the development of a neoplasia with the same properties as the Yoshida ascites tumor.