Noun
English Wikipedia has an article on:sirtuinWikipedia
sirtuin (plural sirtuins)
(biochemistry) Any of several enzymes that act as regulatory factors that mediate the life-extending effects of a low-calorie diet.
He and his team knocked out the sirtuin 1 (SIRT1) gene, which produces the major mammalian sirtuin, in the epithelial cells of mice. Source: Internet