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Identification of SARS-CoV2 genomes under purifying selection bias (a) and positive selection bias (b) by using the codon-based test aided by the Nei-Gojobori method is shown. The probability of rejecting the null hypothesis of strict-neutrality (dN = dS) in favour of the alternative hypothesis (dN < dS for purifying selection and dN > dS for positive selection) is represented as shown in different colours.
