The article discusses research being done on the reversal of DNA methylation patterns by infusing methionine into the brains of adult rats that had received either low or high levels of maternal care. It references a study by I. C. G. Weaver et al published in a 2005 issue of the "Journal of Neuroscience." The study discovered that increased methionine levels induce hypermethylation of the glucocorticoid receptor promoter in rats that had received high levels of maternal care.