A reference codon chart for the three-letter RNA codes and their corresponding amino acids. Below are the nucleotides and their abbreviations, followed by amino acids and their full name, three letter code, and single letter abbreviations.
2nd position
1st position
U
C
A
G
3rd position
U
Phe
Ser
Tyr
Cys
U
U
Phe
Ser
Tyr
Cys
C
U
Leu
Ser
stop
stop
A
U
Leu
Ser
stop
Trp
G
C
Leu
Pro
His
Arg
U
C
Leu
Pro
His
Arg
C
C
Leu
Pro
Gln
Arg
A
C
Leu
Pro
Gln
Arg
G
A
Ile
Thr
Asn
Ser
U
A
Ile
Thr
Asn
Ser
C
A
Ile
Thr
Lys
Arg
A
A
Met
Thr
Lys
Arg
G
G
Val
Ala
Asp
Gly
U
G
Val
Ala
Asp
Gly
C
G
Val
Ala
Glu
Gly
A
G
Val
Ala
Glu
Gly
G
Nucleotide Abbreviations
A
Adenine
G
Guanin
C
Cytosine
T
Thymine
U
Uracil
Amino Acid Abbreviations
Alanine
Ala
A
Asparagine
Asn
N
Aspartic acid
Asp
D
Arginine
Arg
R
Cysteine
Cys
C
Glutamic Acid
Glu
E
Glutamine
Gln
Q
Glycine
Gly
G
Histidine
His
H
Isoleucine
Ile
I
Lysine
Lys
K
Leucine
Leu
L
Methionine
Met
M
Phenylalanine
Phe
F
Proline
Pro
P
Serine
Ser
S
Threonine
Thr
T
Tryptophan
Trp
W
Tyrosine
Tyr
Y
Valine
Val
V
