File:One-carbon metabolism and the transsulfuration pathway.jpg

By Michael C Reed1, Rachel L Thomas1 , Jovana Pavisic1,2 , S Jill James3 , Cornelia M Ulrich4 and H Frederik Nijhout2 (A mathematical model of glutathione metabolism) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons