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Also, nuclei are in telophase during the early half of G1 but at interphase during the late half. Thus, while nuclei are at interphase during the early third of S, they are in prophase during the late two-thirds as well as during G2. We conclude that there is overlap between some mitotic phases and cycle stages. After 60 min, label was in late prophase, after 120 min, in mid telophase and after 180 min, in late telophase. Metaphase I: Instead of all chromosomes pairing up along the. Prophase I: Identical to Prophase in mitosis. Ten minutes after an intravenous injection of 3H-thymidine, 38% of labelled isthmal cells were in interphase and 62% in early or mid prophase, while cells in late prophase and other mitotic phases were unlabelled. Interphase I: Identical to Interphase in mitosis. In accordance with this, the duration of the whole mitotic process was 8.4 hr. From the frequency of mitotic phases, defined as indicated in the preceding article (El-Alfy & Leblond, 1987) and corrected for the probability of their occurrence, it was estimated that prophase lasted 4.8 hr metaphase, 0.2 hr anaphase, 0.06 hr and telophase, 3.3 hr, while the interphase lasted 5.4 hr. Estimates for the duration of the G1 and G2 stages were 6.8 and 1.0 hr, respectively.

The duration of the isthmal cell cycle was found to be 13.8 hr and that of the DNA-synthesizing (S) stage, 5.8 h. The kinetics of isthmal cells in mouse antrum were examined in three ways: the duration of cell cycle and DNA-synthesizing (S) stage was measured by the 'fraction of labelled mitoses' method the duration of interphase and mitotic phases was determined from how frequently they occurred and mice were killed at various intervals after an intravenous injection of 3H-thymidine to time the acquisition of label by the various phases of mitosis.