Cover: An example of a protein association network from the STRING database (http://string-db.org), centered on the query protein 'hisB' from Escherichia coli. The lines indicate functional associations between proteins and are colored according to the type of supporting evidence. Miniature structure representations are shown when a 3D protein structure is available. For further information, see the paper by Jensen et al. in this issue (Nucleic Acids Res. 2009; 37: D412–D416).
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