Children may be susceptible to adverse effects of environmental exposures depending on their genetic make-up and expression of key enzymes. Epigenetic markers, including DNA methylation, play an important role in disease and development. The associations between methylation in children and eariy life exposures, sex, age,and onset of puberty are unknown. This information from minority children is imperative for completing the Human Epigenome Project and informing policy decisions to protect children's health.
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