Bone marrow from C57BL mice with myeloid leukemia induced by Graffi virus has been studied with the electron microscope by ultrathin section and negative stain techniques. Virus particles were usually found in different types of bone marrow cells as well as in extracellular spaces. However, the highest number of particles in various stages of maturation was observed in the cytoplasm of megakaryocytes. Two main types of virus particle were found: the immature Al particle and the mature C particle. They were morphologically indistinguishable from other murine leukemogenic viruses. In partially purified preparations studied by negative staining, some of the particles which were not penetrated by PTA, frequently showed a tail-like structure of variable length. In ultrathin sections, particles were found to originate by budding from the cell membranes. Budding of particles was particularly evident in megakaryocytes and especially within the granules and cytoplasmic vesicles or in connection with the platelet demarcating membranes. The findings of a high number of virus particles in all stages of maturation in megakaryocytes together with a certain degree of megakaryocytosis observed in the bone marrow suggest that this type of cell is possibly one of the main source of production of the virus. A few particles resembling morphologically mycoplasma were detected within the cytoplasm of some immature bone marrow cells.
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