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[An electron-autoradiographic study of capillaries in malignant tumors].

Using electron microscopy the ultra structure of endothelial cells in malignant tumors (myogenic sarcomas), removed in 6 patients, was investigated. It was found that endothelial cells of blood capillaries in malignant neoplasms show some peculiar features in the basal layer structure and in formation of a multitude of orifices of various diameter in the capillary wall. Electron radiographic investigations of endothelial cells of a transplantable sarcoma strain in the experiment have evidenced a greater number of ribosomes in the cytoplasm and enhancement of the DNA synthesis in nuclei. These findings are indicative of increased proliferative properties of these cells.