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Table 9 Amino acid classification

From: Sequence-based prediction of protein-protein interactions using weighted sparse representation model combined with global encoding

Amino acid classification
Aliphatic amino acid: C1 = {A,V,L,I,M,C}
Aromatic amino acid: C2 = {FW,Y}
Polar amino acid: C3 = {S,TN,Q}
Positive amino acid: C4 = {K,R}
Negative amino acid: C5 = {D,E}
Special conformations: C6 = {G,P}