Messenger RNA Codons
 
Second Base
UCAG
F
i
r
s
t

B
a
s
e
UUUU phenylalanine
UUC phenylalanine
UUA leucine
UUG leucine
UCU serine
UCC serine
UCA serine
UCG serine
UAU tyrosine
UAC tyrosine
UAA stop
UAG stop
UGU cysteine
UGC cysteine
UGA stop
UGG tryptophan
U
C
A
G
T
h
i
r
d

B
a
s
e
CCUU leucine
CUC leucine
CUA leucine
CUG leucine
CCU proline
CCC proline
CCA proline
CCG proline
CAU histidine
CAC histidine
CAA glutamine
CAG glutamine
CGU arginine
CGC arginine
CGA arginine
CGG arginine
U
C
A
G
AAUU isoleucine
AUC isoleucine
AUA isoleucine
AUG methionine
ACU threonine
ACC threonine
ACA threonine
ACG threonine
AAU asparagine
AAC asparagine
AAA lysine
AAG lysine
AGU serine
AGC serine
AGA arginine
AGG arginine
U
C
A
G
GGUU valine
GUC valine
GUA valine
GUG valine
GCU alanine
GCC alanine
GCA alanine
GCG alanine
GAU aspartate
GAC aspartate
GAA glutamate
GAG glutamate
GGU glycine
GGC glycine
GGA glycine
GGG glycine
U
C
A
G


Abbreviated Names of Amino Acids