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The 2FoFc map at 1.0 sigma on S84 and the anomalous difference map at 4.0 sigma on the three Zn2+ ions in the active site of the H135D-TAP structure. The difference map identifies all metal binding sites occupied with Zn2+, although the M3 metal has an unexpected octahedral coordination sphere (coordination on M3 shown in black lines).
