GO:0046872 - metal ion binding GO:0005515 - protein binding GO:0042802 - identical protein binding GO:0004768 - stearoyl-CoA 9-desaturase activity GO:0016491 - oxidoreductase activity GO:0005506 - iron ion binding GO:0016717 - oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water GO:0020037 - heme binding