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. 2017 Feb 21;45(7):3922–3931. doi: 10.1093/nar/gkx124

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© The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Nucleotide frequency biases around the initiation codons of non-SD genes for each taxonomic group of prokaryotes. The g_n value for each nucleotide at each position was calculated from the average fractions of O_n/N and those of E_n/N among all species belonging to a given bacterial or archaeal taxonomic group. Note that the g_n values at the initiation codon are not shown. The color scheme for each nucleotide is shown in the bottom right. The number of species used is shown for each group (sp., species).