Amino Acid Three letter Code One letter Code
Alanine
Ala
A
Cysteine
Cys
C
Aspartic Acid
Asp
D
Glutamic Acid
Glu
E
Phenylalanine
Phe
F
Glycine
Gly
G
Histidine
His
H
Isoleucine
Ile
I
Lysine
Lys
K
Leucine
Leu
L
Methionine
Met
M
Asparagine
Asn
N
Proline
Pro
P
Glutamine
Gln
Q
Arginine
Arg
R
Serine
Ser
S
Threonine
Thr
T
Valine
Val
V
Tryptophan
Trp
W
Tyrosine
Tyr
Y
Citrulline
Cit
Hydroxyproline
Hyp
Ornithine
Orn
B‐Alanine
B‐Ala
When Asparagine and Glutamine are hydrolyzed, they are deamidated to the respective acids and
cannot be differentiated. Therefore, the resulting mixtures are designated as Asx and Glx.
Asparagine/Aspartic Acid Asx
B
Glutamine/Glutamic Acid Glx
Z