Additional file 2.

Principal component analysis of the 20-dimentional amino acid frequency matrix. Prin1, Prin2 and Prin3 were the top three components, accounting for 43.91%, 16.84% and 11.06% of the total information, respectively. (a) Factorial plane of Prin1 and Prin2. (b) Factorial plane of Prin1 and Prin3. (c) Factorial plane of Prin2 and Prin3.

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Chen et al. BMC Evolutionary Biology 2013 13:219   doi:10.1186/1471-2148-13-219