To determine the transition/transversion ratio (ti/tv) in the 3′ UTR miRNA binding site SNPs, the fixed SNPs identified in the miRNA binding sites were sorted into two mutational classes based on the variants observed: a transition class (A↔G, C↔T) and a transversion class (A↔C, A↔T, C↔G, G↔T). Using a custom python script, the number of variants were summed for each group and the ti/tv ratio was calculated.
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