The 20 amino acids that make up proteins are: Serine (Ser,S), Threonine (Thr,T), Cysteine (Cys,C), Asparagine (Asn,N), Glutamine (Gln,Q) and Tyrosine (Tyr, Y), Glycine (Gly,G), Alanine (Ala,A), Valine (Val,V), Leucine (Leu,L), Isoleucine (Ile,I), Methionine (Met,M), Proline (Pro,P ), Phenylalanine (Phe,F) and Tryptophan (Trp,W), Aspartic Acid (Asp,D) and Glutamic Acid (Glu,E), Lysine (Lys,K), Arginine (Arg,R) and Histidine (His, h)