as unique prosthetic group of a variety of enzymes , presumably as se ( 2- ) , se functions with tocopherol to protect cell and organelle membranes from oxidative damage , to facilitate the union between oxygen and hydrogen at the end of the metabolic chain , and to transfer ions across cell membranes , in protein synthesis in erythrocytes and in liver organelles , in immunoglobulin synthesis , and in ubiquinone syntheses .
C0007634
cell
C0007603
cell