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. 2004 Dec 21;88(3):1560–1569. doi: 10.1529/biophysj.104.050427

TABLE 1.

The hydrophobicity matrix MIJ

I II III
I Ala 0.0 0.1 0.1
II Ile, Leu, Met, Pro, Val 0.9 2.8
III Phe, Trp, Tyr 3.2

Hydrophobic amino acids are divided into three categories. The matrix MIJ represents the size of hydrophobicity interaction when an amino acid of type I is in contact with an amino acid of type J.