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The catalytic triad of NlpC/P60_ 2 (blue, PDB code 4EZY), the putative “xylanase” (red, PDB code 2P1G), and AvPCP (cyan, PDB code 2HBW). The fourth functionally important tyrosine residues in NlpC/P60_2 (Tyr71), 2P1G (Tyr38) and 2HBW (Tyr114) are also shown.
