Additional file 2.

Summary of the test statistics for the likelihood ratio test of codon evolution. Notes: df refers to degrees of freedom. Test statistics were computed using formula 2 (Lb - La); La and Lb are log-likelihood values for each of the nested models being compared.

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Zhao et al. BMC Evolutionary Biology 2013 13:113   doi:10.1186/1471-2148-13-113