 The name derives from the visual similarity of the domain to nigiri sushi when the primary structure is drawn showing the loops created by the disulfide bonds.Sushi domains exist in a wide variety of complement and adhesion proteins.The structure is known for this domain; it is based on a beta-sandwich arrangement - one face made up of three β-strands hydrogen-bonded to form a triple-stranded region at its centre, and the other face formed from two separate β-strands.