The phenotype and division rates of the grafts’ thymocytes. Grafts were performed as in Fig. 1 B. At different time points, mice were injected with BrdU 1 h before sacrifice. (A) BrdU incorporation in DP cells in 1 out of 8 experiments with similar results. (B) The phenotype of CD45.1⁺ TN donor thymocytes at different time points after grafting. The percentage of cells incorporating BrdU in is italicized and in brackets. Results are from one out of 15 equivalent experiments (C) The phenotype of CD45.1⁺ TN1–TN2 thymocytes. Results are from one of five identical experiments.