Glutathione-requiring prostaglandin D synthase (EC 5.3.99.2) (Glutathione-dependent PGD synthetase) (Prostaglandin-H2 D-isomerase) (Hematopoietic prostaglandin D synthase) (H-PGDS); Catalyzes the conversion of PGH2 to PGD2, a prostaglandin involved in smooth muscle contraction/relaxation and a potent inhibitor of platelet aggregation (199 aa)