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Structural environment around substituted tryptophan residues: Trp38 (A), Trp69 (B), and Trp95 (C) in P61A FIS. Replacements of tyrosines were made in silico in the structure of P61A FIS (1FIP) using the software PyMol. Residues that are proposed as interacting with tryptophan residues are labeled. Ribbon backbones of different subunits are colored differently. Hydrogen bonding in panel C is represented by a dotted line.
