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Molecular structure of recombinant wild-type cyt b562 showing the heme coordination environment and the location of the His-63–Gly-64 ligation site. Coordinates were obtained from the Protein Data Bank (K. Hamada, P. H. Bethge, F. S. Mathews, PDB accession no. 256B; see also ref. 28), and the illustration was made using DEEP VIEW in slab mode to provide an unobstructed view of the active site approximately along the four-helical bundle axis.
