Methylation status in PMN and T lymphocytes. (A) Methylation status of the p15^INK4B gene of BM-MNC at leukemic phase and those of PB-PMN cells at CMMoL phase of patient no. 26 are shown. (B) The methylation status of the p15^INK4B gene of various cell populations from patient no. 3 is shown. PB-T lymphocytes at leukemic phase and PB-PMN cells at complete remission showed the unmethylated p15^INK4B gene pattern.