3构成蛋白质的20种氨基酸 Alanine(Ala) Arginine (Arg Asparagine (Asn) Aspartic Acid (Asp Cysteine(Cys) Glutamine (GIn) Glutamic Acid(Glu) Glycine (Gly) OH HbC HaC CH3 NH2 Histidine ( his) Isoleucine (e) Leucine (Leu) ysine (lys) HaC NH H Methionine (Me Phenylalanine (Phe) Proline (Pro) Serine (ser) CH 且 NH2 Threonine (Thr) Tryptophan (Trp) Tyrosine (Tyr) aline (val)3.构成蛋白质的20种氨基酸