Figure 2From: Quantitative leukocyte BDNF promoter methylation analysis in bipolar disorder Correlation between age and CpG unit methylation. Methylation at amplicon D2a is correlated with age in bipolar cases but not in controls. Black, BP cases (rho = 0.56, p = 2.80 × 10−5). Gray, controls (rho = 0.17, p = 0.25).Back to article page