In the old nature/nurture debate, where scientists argue whether it is your inherited genes or your environmental context that determines your predisposition to disease, researchers have encountered a new level or complexity.
Scientists have discovered, according to a report published in "LiveScience", that genes have "epigenetic markers," or mechanisms that increase the gene's influence. These markers, it turns out, are controlled by environmental factors. It requires a certain environmental "trigger" to activate the epigenetic marker, which then fires up the gene to express itself.
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