Fig. 5. Slow cycling cells are resistant to hydroxyurea (HU) treatment.

Hydra were pulsed with EdU for one week, chased for two days and then treated with hydroxyurea for five days. The percentage of EdU retaining interstitial cells (1s and 2s) at the end of hydroxyurea treatment, at one day after hydroxyurea treatment and three days after hydroxyurea treatment is shown. The data represent mean and standard deviation from two independent experiments.