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二十二种常规氨基酸组成多肽和蛋白。其中20种由遗传密码编码的天然氨基酸，剩余的两种，硒代半胱氨酸和吡咯赖氨酸通过独特的合成机制掺入蛋白质中。
| 名称/分子式 | M.W. | pI | CAS No. | Structure |
| Alanine (Ala/A) CH3-CH(NH2)-COOH | 89.09 | 6 | 56-41-7 |  |
| Arginine (Arg/R) HN=C(NH2)-NH-(CH2)3-CH(NH2)-COOH | 174.2 | 11.15 | 74-79-3 |  |
| Asparagine (Asn/N) H2N-CO-CH2-CH(NH2)-COOH | 132.12 | 5.41 | 5794-13-8 |  |
| Aspartic acid (Asp/D) HOOC-CH2-CH(NH2)-COOH | 133.1 | 2.77 | 56-84-8 |  |
| Cysteine (Cys/C) HS-CH2-CH(NH2)-COOH | 121.15 | 5.02 | 52-90-4 |  |
| Glutamine (Gln/Q) H2N-CO-(CH2)2-CH(NH2)-COOH | 146.15 | 5.65 | 56-85-9 |  |
| Glutamic acid (Glu/E) HOOC-(CH2)2-CH(NH2)-COOH | 147.13 | 3.22 | 56-86-0 |  |
| Glycine (Gly/G) NH2-CH2-COOH | 75.07 | 5.97 | 56-40-6 |  |
| Histidine (His/H) N=C-NH-C=C-CH2-CH(NH2)-COOH | 155.16 | 7.47 | 71-00-1 |  |
| Isoleucine (Ile/I) CH3-CH2-CH(CH3)-CH(NH2)-COOH | 131.17 | 5.94 | 73-32-5 |  |
| Leucine (Leu/L) (CH3)2-CH-CH2-CH(NH2)-COOH | 131.17 | 5.98 | 61-90-5 |  |
| Lysine (Lys/K) H2N-(CH2)4-CH(NH2)-COOH | 146.19 | 9.59 | 39665-12-8 |  |
| Methionine (Met/ M) CH3-S-(CH2)2-CH(NH2)-COOH | 149.21 | 5.74 | 63-68-3 |  |
| Phenylalanine (Phe/F) Ph-CH2-CH(NH2)-COOH | 165.19 | 5.48 | 63-91-2 |  |
| Proline (Pro/P) NH-(CH2)3-CH-COOH | 115.13 | 6.3 | 147-85-3 |  |
| Serine (Ser/S) HO-CH2-CH(NH2)-COOH | 105.09 | 5.68 | 56-45-1 |  |
| Threonine (Thr/T) CH3-CH(OH)-CH(NH2)-COOH | 119.12 | 5.64 | 72-19-5 |  |
| Tryptophan (Trp/W) Ph-NH-CH-C-CH2-CH(NH2)-COOH | 204.23 | 5.89 | 73-22-3 |  |
| Tyrosine (Tyr/Y) HO-p-Ph-CH2-CH(NH2)-COOH | 181.19 | 5.66 | 60-18-4 |  |
| Valine (Val/V) CH3-CH(CH2)-CH(NH2)-COOH | 117.15 | 5.96 | 72-18-4 |  |
