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(A) Reaction of cellulose chain opening by the polysaccharide monooxygenases, via H-atom abstraction from the 1 position, as proposed by Phillips et al. (B) End-on bound superoxide structure of PMO-2 from Neurospora crassa (pdb: 4EIR). Gold sphere: Cu, Red spheres: oxygen. Second sphere residues Y168 and Q166 (<4Å from the Cu) are included
