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(a) Stereoview of the superposition of Phdpd (Cyan) with Zn-Phdpd (Yellow) and Zn-Pfprol (Pink) structures. (b) Stereoview of the conserved active site residues superimposed between the Phdpd (cyan) and Zn-Phdpd (yellow). Two active site metal atoms of Zn-Phdpd and two water molecules (W278 and W279) of Phdpd are shown in yellow and red color spheres, respectively. The side chains of the conserved active site residues are labeled according to Phdpd sequence numbering.
