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Table 15 Classification of amino acids

From: Performance of rotation forest ensemble classifier and feature extractor in predicting protein interactions using amino acid sequences

Aliphatic amino acids D1 = {A,V,L,I,M,C}
Aromatic amino acids D2 = {F,W,Y,H}
Polar amino acids D3 = {S,T,N,Q}
Positive amino acids D4 = {K,R}
Negative amino acids D5 = {D,E}
Special shape D6 = {G,P}