Comparison of P1 methylation in repopulating and non-repopulating cell types. (A) Percent CpG methylation at P1 promoter in repopulating (R) and non-repopulating (NR) cell populations. Bar indicates the mean. **P < .01 (unpaired Student t test). (B) Percent methylation at individual CpGs within P1 promoter in repopulating and non-repopulating cell populations. Bar indicates the mean. **P < .01; *P < .05 (unpaired Student t test). ns, not significant.