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Methylation box plots in newborns (n = 378) and 9-year-old (n = 247) children. DNA methylation was measured using 450K BeadChip. The box plots show methylation levels at 16 CpG sites in the PON1 gene in (A) umbilical cord blood and (B) 9-year-old blood. CpG site numbers correspond to those listed in Table 1
