| Term | Definition |
| glycine | G, Gly, nonpolar aliphatic |
| alanine | A, Ala, nonpolar aliphatic |
| valine | V, Val, nonpolar aliphatic |
| leucine | L, Leu, nonpolar aliphatic |
| isoleucine | I, Ile, nonpolar aliphatic |
| methionine | M, Met, polar uncharged |
| proline | P, Pro, nonpolar aliphatic, lowest flexibility |
| phenylalanine | F, Phe, aromatic hydrophobic |
| tyrosine | Y, Tyr, aromatic less hydrophobic |
| tryptophan | W, Try, aromatic less hydrophobic |
| serine | S, Ser, polar aliphatic hydroxyl |
| threonine | T, Thr, polar aliphatic hydroxyl |
| cysteine | C, Cys, polar aliphatic sulfhydryl |
| lysine | K, Lys, very polar basic |
| arginine | R, Arg, very polar basic |
| histidine | H, His, very polar basic |
| aspartate | D, Asp, (-) charged acidic |
| glutamate | E, Glu, (-) charged acidic |
| asparagine | N, Asn, uncharged acidic |
| glutamine | Q, Gln, uncharged acidic |