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(A and B) Ratio of non-TTR signal transduction genes to total protein-coding genes among bacterial (A) and archaeal (B) genomes. The dashed line indicates the average ratio of signal transduction genes to protein-coding genes across all phyla. Bacterial and archaeal phylum are listed below their respective groups, with the class following a semicolon. To view the supporting data, see File S7 in the supplemental material.
