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View of the active site of NDO-P (from PDB id 1EG9) in green, NDO-R (structure 2) in yellow, and BPDO-R (from PDB id 1ULJ) in purple. The figure illustrates the positions of the bound substrate, the active site mononuclear iron, and the side chains of the residues that interact (similarly or differently) with the bound substrate as discussed in the text.
