Here are the 20 standard amino acids found in the human body, along with their three-letter and one-letter abbreviations:

Non-polar (hydrophobic)

1. Alanine (Ala, A)

2. Valine (Val, V)

3. Leucine (Leu, L)

4. Isoleucine (Ile, I)

5. Proline (Pro, P)

6. Phenylalanine (Phe, F)

7. Methionine (Met, M)

8. Tryptophan (Trp, W)

9. Glycine (Gly, G)

Polar (hydrophilic)

10. Serine (Ser, S)

11. Threonine (Thr, T)

12. Cysteine (Cys, C)

13. Tyrosine (Tyr, Y)

14. Asparagine (Asn, N)

15. Glutamine (Gln, Q)

Acidic

16. Aspartic Acid (Asp, D)

17. Glutamic Acid (Glu, E)

Basic

18. Lysine (Lys, K)

19. Arginine (Arg, R)

20. Histidine (His, H)