Glycine

(G)

Gly

Side Group: H

Alanine

(A)

Ala

Side group: CH₃

Proline

(P)

Pro

Side group: (CH₂)₃ connected to α-carbon and amino group

Valine

(V)

Val

Side group: CH-CH₃-CH₃

Leucine

(L)

Leu

Side group: CH₂-CH-CH₃-CH₃

Isoleucine

(I)

Ile

Side group: CH-(CH₂)₂-CH₃

Methionine

(M)

Met

Side group: CH₂-CH₂-S-CH₃

Tryptophan

(W)

Trp

Side group: CH₂-indole group (2 rings w/ NH)

Phenylalanine

(F)

Phe

Side group: CH₂-phenyl ring

Serine

(S)

Ser

Side group: CH₂-OH

Threonine

(T)

Thr

Side group: CH-CH₃-OH

Tyrosine

(Y)

Tyr

Side group: CH₂-phenyl ring-OH

Asparagine

(N)

Asn

Side group: CH₂-CONH₂

Glutamine

(Q)

Gln

Side group: CH₂-CH₂-CONH₂

Cysteine

(C)

Cys

Side group: CH₂-SH

Lysine

(K)

Lys

Side group: (CH₂)₄-NH₃⁺

Arginine

(R)

Arg

Side group: (CH₂)₃-NH-C(NH2)₂

Histidine

(H)

His

Side group: CH₂-imidazole group

Aspartate

(D)

Asp

Side group: CH₂-COO^-

Glutamate

(E)

Glu

Side group: CH₂-CH₂-COO^-