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The metal-binding sites of PNGM-1 wild-type and variants. The 2FoFc electron density maps contoured at 1.0 e/Å3 are shown (blue mesh) for (A) PNGM-1 wild-type, (B) H91A variant, (C) H93A variant, (D) H96A variant, (E) H257A variant, and (F) H279A variant.
