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Purifying selection on Carsonella protein-coding genes. (A) Distribution of gene-specific dN/dS values based on Carsonella divergence within Pachypsylla hosts. (B) Correlation between gene-specific dN/dS values across the three host genera. Dotted lines show that the neutral expectation of dN/dS = 1. Carsonella genomes are specified by host name initials.
