Aliphatic
Alanine glycine isoleucine leucine proline valine
Aromatic
Phenylalanine tryptophan tyrosine
Acidic
Aspartic acid glutamic acid
Basic
Arginine histidine lysine
Hydroxylic
Serine threonine
Sulfur containing
Methionine cysteine
Amidic
Asparagine glutamine