Los 20 aminoácidos son:

Glicina (Gly, G)
Alanina (Ala, A)
Valina (Val, V)
Leucina (Leu, L)
Isoleucina (Ile, I)
Prolina (Pro, P)
Serina (Ser, S)
Treonina (Thr, T)
Cisteína (Cys, C)
Metionina (Met, M)
Asparragina (Asn, N)
Glutamina (Glu, Q)
Fenilalanina (Phe, F)
Tirosina (Tyr, Y)
Triptófano (Trp, W)
Lisina (Lys, K)
Arginina (Arg, R)
Histidina (His, H)
Aspartato (Asp, D)
Glutamato (Glu, E)