| Abstract: | Circadian variations in the frequency of mitoses and the number of nuclei labed with thymidine-H3 in sarcoma-37 of mice were investigated. It was shown that the circadian rhythm of mitotic activity was composed of diurnal variations in the frequency of labeled and unlabeled mitoses. The G2-phase of mitotic cycle of the cells with labeled mitosis was approximately one hour. The G2-phase of the cells with unlabed mitosis lasted four hours and more. It is suggested that there are two cell populations in sarcoma-37. |
