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. 2009 Jan 20;65(Pt 2):176–185. doi: 10.1107/S0907444908037591

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© Joosten et al. 2009

This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Detail of PDB entry 1lf2 after one round of manual optimization (a) and the final model (b) in 2mF _o − DF _c electron-density maps (contoured at 2.0σ) and mF _o − DF _c difference density (contoured at 4.0σ). Based on the crystallization conditions described in Asojo et al. (2002 ▶), the tetrahedral difference-map peak in (a) was modelled as a sulfate. Lys238A was modelled as an arginine based on the (difference) density map contours. The H^∊ of this arginine in (b) makes a hydrogen bond to the backbone carbonyl of Leu242A. The figures were created with Coot (Emsley & Cowtan, 2004 ▶) and Raster3D (Merritt & Bacon, 2007 ▶).