1CTZ:
reference: Mutation of tyrosine-67 to phenylalanine in cytochrome c significantly alters the local heme environment., Berghuis AM, Guillemette JG, Smith M, Brayer GD, J Mol Biol 1994 Jan 28;235(4):1326-41. PMID: 8308895

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).