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. 2013 Dec 17;7(Suppl 2):S15. doi: 10.1186/1752-0509-7-S2-S15

Table 2.

Classification of amino acids

# groups classification of amino acids
2 MLVICGATSPFYW/DENQRKH
4 MLVIC/GATSP/FYW/DENQRKH
8 MLVIC/GA/TS/P/FYW/DENQ/RK/H
10 MLVI/C/G/A/TS/P/FYW/DENQ/RK/H
15 MLVI/C/G/A/T/S/P/FY/W/D/E/N/Q/RK/H

Classification of amino acids by Murphy et al. [34]. The two groups are classified by the hydrophobic and hydrophilic properties of amino acid side-chains. The group of (FYW) is aromatic hydrophobic, (TS), (DENQ), and (RK) are polar.