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