(‘diabetes mellitus type 2’/exp OR ‘diabetes mellitus type 2’ OR ‘diabetes mellitus, noninsulin-dependent’ OR ‘diabetes mellitus, non-insulin-dependent’/exp OR ‘diabetes mellitus, non-insulin-dependent’ OR ‘diabetes mellitus, type ii’/exp OR ‘diabetes mellitus, type ii’ OR ‘niddm’/exp OR ‘niddm’ OR ‘type 2 diabetes’/exp OR ‘type 2 diabetes’ OR ‘dm2’ OR ‘t2dm’/exp OR ‘t2dm’) AND (‘a2m protein, human’ OR ‘α2-macroglobulin’ OR ‘salivary α2-macroglobulin’ OR ‘α2-mg’ OR ‘alpha 2-macroglobulin’/exp OR ‘alpha 2-macroglobulin’ OR ‘a2mg’). The gene discussed is A2M; the disease is type 2 diabetes mellitus.