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. Author manuscript; available in PMC: 2016 Feb 25.
Published in final edited form as: Ann Appl Stat. 2014 Dec 19;8(4):2068–2095. doi: 10.1214/14-AOAS780

Table 5.

Simple amino acid classification based on chemical properties

Group Type Amino acids
1 Non-polar, hydrophobic A, V, L, I, P, M, F, W
2 Polar, hydrophilic G, S, T, C, N, Q, Y
3 Acidic D, E
4 Basic K, R, H