Fig. 1From: Genotype-dependent associations between serotonin transporter gene (SLC6A4) DNA methylation and late-life depressionDistribution of SLC6A4 methylation levels at each CpG unit and mean methylation levels across the region studied for all study participants. The box denotes the interquartile range (IQR: 25–75% percentiles), the line shows the median and the whiskers are 1.5 x IQR below the 25% percentile or above the 75% percentileBack to article page