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The hemes found in cytochromes

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a. The covalent bond formed between heme and the protein component in cytochromes c and c1.

The vinyl groups on heme are linked to the thiol groups of two cysteine residues (red).

b. Heme A, the form found in cytochromes a and a3. Note the modified side chains—a formyl group (red) and an isoprenoid side chain (blue).

c. Four-helix bundle structure of cytochrome b562 from E. coli
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