
 Kyte-Doolittle Scale
      A hydrophobicity scale containing hydrophobicity parameters for all
      20 amino acids as determined by Kyte and Doolittle (1982). This
      scale represents the estimated free energy of transfer (DG) of amino
      acids from an aqueous environment to a hydrophobic environment. It
      was extracted from experimental solubility measurements of amino
      acids in ethanol (Tanford, (1970)). The Kyte-Doolittle scale has the
      following values:

                        AA Value AA Value
                        A   1.8   M   1.9
                        C   2.5   N  -3.5
                        D  -3.5   P  -1.6
                        E  -3.5   Q  -3.5
                        F   2.8   R  -4.5
                        G  -0.4   S  -0.8
                        H  -3.2   T  -0.7
                        I   4.5   V   4.2
                        K  -3.9   W  -0.9
                        L   3.8   Y  -1.3

