[Quantitative cytochemical study of the RNA in tumor cells. II. The characteristics of the cell populatoins].

The quantity of DNA and RNA in tymocytes of AKR mice has been determined by Methylen blue staining. Cell populations of normal and tumor animals were divided into two groups with equal content of DNA to measure RNA content in either of them. The tumor cells had up to 380% RNA, if the normal content be taken for 100%. Dynamics of RNA modifications in cells of normal tymocytes corresponded to the increasing DNA quantity. The RNA quantity in tumor cells increased in the beginning of S-phase.