This element is found in rubredoxin proteins, where it is coordinated by four cysteine residues. Proteins that catalyze redox reactions often have clusters of this element and sulfur. (10[1])An ion of this element is found (-5[1])in the active site of an enzyme that degrades hydrogen peroxide, catalase. A protein that contains an ion of this element transitions from a T (10[1])to R state upon oxygen (10[1])binding. (10[1])That protein (10[1])is also compromised in individuals with (10[1])thalassemia, and the heme group is responsible for binding an ion of this element. (10[1])A deficiency of this element in the body results in anemia. (10[1])For 10 points, name this metallic element whose ion gives blood its red color. ■END■ (10[1])