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Neutron scattering length density maps for the active sites in XynII structures. (A) pD6.2, (B) N44D, (C) pD8.9, and (D) pD4.8. 2FO − FC maps are shown as green meshes contoured at 1.2 σ. FO − FC omit maps are shown as red meshes contoured at 3.0 σ in A, B, and C, and at 2.5 σ in D. Hydrogen bonds are shown as blue dotted lines. D atoms are dark cyan whereas H atoms are light gray. Distances are in Å.
