Additional file 4.

Codon usage of predicted F-factor conjugative pilustra-genes in comparison to all strain SZ chromosomal genes using the codon adaptation index (CAI). A majority of genes in the tra-pilus cluster have normalized CAI < 1.00 (red font), but are interspersed with genes having normalized CAI > 1.00, indicating sufficient residence time in strain SZ for the cluster to partially ameliorate to chromosomal codon usage.

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Wagner et al. BMC Genomics 2012 13:200   doi:10.1186/1471-2164-13-200