ChEBI: Alpha,alpha-trehalose is a trehalose in which both glucose residues have alpha-configuration at the anomeric carbon. It has a role as a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite, a mouse metabolite and a geroprotector. A disaccharide formed by a (1<->1)-glycosidic bond between two units of D-glucose. ChEBI: Trehalose is a disaccharide formed by a (1<->1)-glycosidic bond between two units of D-glucose.