Brown University biologists find method to measure ramifications of aging Fly study shows how heterochromatin adjustments with age, diet Biologists at Brown University have found a method to measure the ramifications of aging by watching the ebb and stream of chromatin, a structure along strands of DNA that either permits or silences gene expression. In several newly published experiments they show that gene silencing via chromatin in fruit flies declines with age kaufen . They demonstrated that administering life span extending methods to the flies also, such as for example switching them to a lesser calorie diet or raising expression of the proteins Sir2, restores the observed lack of gene silencing due to age.