Genetic  Code
FIRST POSITION
SECOND POSITION
THIRD 
POSITION
(5')
U
C
A
G
(3')
U
Phe
Phe
Leu
Leu
Ser
Ser
Ser
Ser
Tyr
Tyr
Ter*
Ter*
Cys
Cys
Ter*
Trp*
U
C
A
G
C
Leu
Leu
Leu
Leu
Pro
Pro
Pro
Pro
His
His
Gln
Gln
Arg
Arg
Arg
Arg
U
C
A
G
A
Ile
Ile
Ile
fMet
Thr
Thr
Thr
Thr
Asn
Asn
Lys
Lys
Ser
Ser
Arg
Arg
U
C
A
G
G
Val
Val
Val
Val**
Ala
Ala
Ala
Ala
Aps
Aps
Glu
Glu
Gly
Gly
Gly
Gly
U
C
A
G
*  Translation termination codon 
** Codes for fMet if in the initiator position 


Amino Acids Abbreviations
Amino Acid
3 letter abreviation
1 letter abreviation
M.W.
Alanine           
Ala
A
89
Arginine          
Arg
R
174
Asparagine
Asn
N
132
Aspartic Acid     
Asp
D
133
Asparagine or 
Aspartic Acid     
Asx
B
-
Cysteine          
Cys
C
121
Glutamic Acid     
Glu
E
147
Glutamine         
Gln
Q
146
Glutamine or
Glutamic Acid     
Glx
Z
-
Glycine           
Gly
G
75
Histidine         
His
H
155
Isoleucine        
Ile
I
131
Leucine           
Leu
L
131
Lysine            
Lys
K
146
Methionine        
Met
M
149
Phenylalanine     
Phe
F
165
Proline           
Pro
P
115
Serine            
Ser
S
105
Threonine         
Thr
T
119
Tryptophan        
Trp
W
204
Tyrosine          
Tyr
Y
181
Valine            
Val
V
117

HOME