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Detail of the original structure of TthUVDE wild type with electron density map (contoured at 1.5 σ) showing a carboxyl group modeled into the additional density at the tip of Lys229 (Kcx229). Distances between the oxygen atoms of the carboxyl group and neighboring residues, and the distance of His231 to Mn1 are indicated. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]
