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Annex 4 - Amino acids, one and three letter codes

Amino acid

Three letter code

One letter code

alanine

ala

A

arginine

arg

R

asparagine

asn

N

aspartic acid

asp

D

asparagine or aspartic acid

asx

B

cysteine

cys

C

glutamic acid

glu

E

glutamine

gln

Q

glutamine or glutamic acid

glx

Z

glycine

gly

G

histidine

his

H

isoleucine

ile

I

leucine

leu

L

lysine

lys

K

methionine

met

M

phenylalanine

phe

F

proline

pro

P

serine

ser

S

threonine

thr

T

tryptophan

trp

W

tyrosine

tyr

Y

valine

val

V


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