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. An ion (10[1])of this element is found 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 to R state upon oxygen binding. (10[2])That (10[1])protein is also compromised in individuals with thalassemia, and the heme group (10[1])is responsible for binding an ion of this element. (-5[1])A deficiency of this element in the body results in anemia. (10[1])For 10 points, name this metallic element (10[1])whose ion gives blood its red color. ■END■