Summary of PVE cell cycle phase durations (hours) and experimental intervals
| Embryonic days | TC–TS | TC | Experimental interval (after initial BUdR) |
|---|---|---|---|
| E12 | 5.3 | 10.2 | 6.5 |
| E13 | 7.5 | 11.4 | 9.5 |
| E14 | 11.3 | 15.1 | 12.5 |
| E15 | 13.8 | 17.5 | 15 |
| E16 | 14.4 | 18.4 | 17 |
TC, Length of cell cycle;TS, length of S phase.TC–TS andTC have been established previously (Takahashi et al., 1995a). For the present experiments, the duration of survival after the initial (or only) injection of BUdR was greater thanTC–TS but shorter than would be required for the P fraction to complete a second M phase, i.e., shorter than TC.