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(a) Stereoview of the van der Waals surface (blue) of the PYR binding site in DHFR. Waters and NADPH molecule bound at the active site have been removed for clarity. Coordinates for DHFR are from PDB code 2BL9.14 (b) Stereoview of the van der Waals surface (green) of the PYR binding site of HexB.
