The DNA methylation level for CpG promoter sites was quantified for RARβ2, TIMP3, and CYB5R2 in 91 bisulfite-modified genomic DNA extracted from blood samples from non-cancerous AA men (age range, 42–88 y old). Y-axis; the log 2 value of Age (years). X-axis is the percentages of methylated cytosines in the samples as obtained from pyrosequencing.</p