Principal components projection along the 2 principal eigenvectors (the 1st and 2nd axes) for the distributions of amino acid replacement scores in 12 matrices[1].


  1. Mark S. Johnson and John P. Overington
    A Structural Basis for Sequence Comparisons: An Evaluation of Scoring Methodologies
    J. Mol. Biol. (1993) 233, 716-738.

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