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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Toxicol Sci. 2018 Nov 1;166(1):131–145. doi: 10.1093/toxsci/kfy186

Table 1.

Amino acid classification system.

Amino Acid 1-Letter Side Chain Class Molecular Weight
(g/mol)
Aspartic Acid D Acidic 133.104
Glutamic Acid E Acidic 147.131
Alanine A Aliphatic 89.094
Glycine G Aliphatic 75.067
Isoleucine I Aliphatic 131.175
Leucine L Aliphatic 131.175
Proline P Aliphatic 115.132
Valine V Aliphatic 117.148
Asparagine N Amidic 132.119
Glutamine Q Amidic 146.146
Phenylalanine F Aromatic 165.192
Tryptophan W Aromatic 204.228
Tyrosine Y Aromatic 181.191
Histidine H Basic 155.156
Lysine K Basic 146.189
Arginine R Basic 174.203
Serine S Hydroxylic 105.093
Threonine T Hydroxylic 119.119
Methionine M Sulfur-Containing 149.208
Cysteine C Sulfur-Containing 121.154