AsymmetryScaler create asymmetry index fast and easy, take the substitution matrix produced by AsymmetryCounter and produces an asymmetry index, in which the amino acids are arranged from least preferred in species 2 to most preferred in species 2.

The expected ratio of substitutions in one direction (QAB, the proportion of sites with amino acid A in species 1 and amino acid B in species 2) to substitutions in the opposite direction (QBA) is related to the difference in asymmetry index values using the equation: ln(QAB/QBA)=AIB-AIA

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