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The copper binding histidines (His88/109/118 for Cu1) are in red and (His240/244/274 for Cu2) are in orange. URS in yellow, copper ions in green. ( a) Superimposition of PDBid:1BUG (wheat), modelJrPPO1 (grey) and solvedJrPPO1 (pink). ( b) Three closest residues in solvedJrPPO1 that ligand URS (His108/His239/Phe260) are in blue.
