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(a) COL1A2_P407 methylation (%) compared between lower (n = 13) and higher (n = 11) lead exposure groups (P= 0.004), ‘X’ indicates mean value, and (b) correlation between COL1A2_P407 methylation (%) and the log of blood lead concentrations (µg/dl; r= − 0.45; P= 0.03).
