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. 2002 May 25;267(4):865–880. doi: 10.1006/jmbi.1997.0922

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Copyright © 1997 Academic Press. All rights reserved.

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Stereoview of the 2F_o − F_c electron density of (a) S. typhimurium and (b) S. enteritidis O-antigen octasaccharides at 1.8 Å resolution contoured at 1σ. Repeating unit I is proximal, repeating unit II distal from the active site.