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Surface distribution of aromatic residues Tyr and Trp in CD-hydrolyzing enzymes. Aromatic rings on the protein surface are colored red in SMMA (a), ThMA (b), NPas (c), and CDase (d). Residues at the termini of β-strands and α-helices are highlighted by cyan and magenta, respectively. The number of Tyr and Trp residues that are located at the termini of secondary structure elements and exposed at the surface is indicated.
