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Table 6 The physicochemical properties of the amino acids and distances between two amino acids.

From: An improved classification of G-protein-coupled receptors using sequence-derived features

Order Physicochemical property Range of property Reference
1 Hydrophobicity scales [-1.14, 1.81] [32]
2 Average flexibility indices [0.295, 0.544] [32]
3 Polarizability parameter [0, 0.409] [32]
4 Free energy of solution in water [-2.24, 4.91] [32]
5 Residue accessible surface area in tripeptide [75, 255] [32]
6 Residue volume [36.3, 135.4] [32]
7 Steric parameter [0, 1.02] [32]
8 Relative mutability [18, 134] [32]
9 Hydrophobicity [-2.53, 1.38] [33]
10 Hydrophilicity [-3.4, 3] [33]
11 Side-chain mass [1, 130] [33]
12 Normalized van der Waals volume [0, 8.08] [34]
13 Polarity [4.9, 13.0] [34]
14 Polarizability [0, 0.409] [34]
15 Charge Positive, Neutral, Negative [34]
16 Secondary structure Helix, Strand, Coil [34]
17 Solvent accessibility Buried, Exposed, Intermediate [34]
18 Relative hydrophobicity Polar, Neutral, Hydrophobic [34]
19 Grantham chemical distance [0, 215] [34]
20 Schneider-Wrede physicochemical distance [0, 1] [19]