Analysis of thymocytes from aged mice and proliferation potential. (A) Bars indicate the cell number of thymocytes from WT and TG mice. (B) Bars indicate the relative cell number of thymocyte subsets CD4⁺ SP, DP, DN, or CD8⁺ SP from WT (white) and TG (gray) mice. (C) Bars indicate cpm thymidine uptake of different thymocyte subsets from WT and TG mice. White or gray bars represent WT or TG mice, respectively. ^*P < .05; ^**P < .005; ^***P < .0005. Analyses were performed on 15 mice. Bars show the mean ± 1 SEM.