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. 2011 Jul 25;12:374. doi: 10.1186/1471-2164-12-374

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Copyright ©2011 Retchless and Lawrence; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Codon selection as a function of tRNA gene number in Enterobacteriaceae. All codon statistics were calculated using the Translation40 gene set to construct f_oand the shared set of ORFs to construct f_n. A. ACEχ²calculated on all shared genes, for the set of 14 free-living bacteria (1060 genes; open circles, thick line) and a set of 4 endosymbionts along with 11 free-living bacteria (201 genes; filled circles, thin line). B. ACEχ², like other statistics, calculated on Translation40 gene set.