Table 1.

Amino acids grouped by class

Class	Included amino acids
aliphatic	Methionine (M), Leucine (L), Inosine (I), Valine (V), Alanine (A)
small polar	Cysteine (C), Serine (S), Threonine (T), Asparagine (N), Glutamine (Q)
negative	Aspartic Acid (D), Glutamic acid (E)
positive	Arginine (R), Lysine (K)
aromatic	Histidine (H), Tyrosine (Y), Phenylalanine (F), Tryptophan (W)
unique	Proline (P), Glycine (G)