[Tumor cell ultrastructure].

The ultrastructure of tumor cells, as compared with normal ones, was studied morphometrically. It was found that the relationship between the ergastoplasmic apparatus and polyribosomal one could serve as an objective criterion of the degree of differentiation of normal cells under study. Tumor cells did not differ from normal cells with regard to one system of organells being more highly developed than the other, but they did from the point of view of different relations between the protein-synthesizing and energetic apparatuses. Also, tumor cells were found to be less differentiated than normal, and more malignant tumors show no less differentiation than more benign ones. Tumor cells are likely to have their own trends of development that differ from the processes of normal cells differentiation.