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Amino Acid R groups
Non-polar Polar, uncharged Aromatic Positively charged Negatively
Glycine Serine Phenylalanine Lysine Aspartate
Alanine Threonine Tyrosine Arginine Glutamate
Proline Cysteine Tryptophan Histidine
Although there are 20 amino acids, they fall in to several categories,