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