Amino acid scale: Normalized frequency for alpha helix.
Author(s): Levitt M.
Reference: Biochemistry 17:4277-4285(1978).
Amino acid scale values:
Ala: 1.290
Arg: 0.960
Asn: 0.900
Asp: 1.040
Cys: 1.110
Gln: 1.270
Glu: 1.440
Gly: 0.560
His: 1.220
Ile: 0.970
Leu: 1.300
Lys: 1.230
Met: 1.470
Phe: 1.070
Pro: 0.520
Ser: 0.820
Thr: 0.820
Trp: 0.990
Tyr: 0.720
Val: 0.910
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