. "|FRAME: CPLX-5883|, a ubiquitous flavoenzyme, catalyzes the reduction of |FRAME: OXIDIZED-GLUTATHIONE| back to two individual reduced |FRAME: GLUTATHIONE| molecules. The enzyme has been isolated multiple times from human erythrocytes |CITS: [4448168][8143][923580]|. It is composed of two identical subunits of 50 kDa, and has the dimensions of 5.5 x 5.0 x 4.5 nm |CITS: [1274]|. The binding sites of NADPH and GSSG are located on opposite sides of one subunit, which means that the electrons are transported across the subunit during catalysis |CITS: [9277]|. The catalytic center contains FAD as a prosthetic group and a redox-active cystine residue |CITS: [9277]|."^^ . . . . . "GR"^^ . "glutathione reductase"^^ .