TRES Transcription Regulatory Element Search
a tool for Comparative Promoter Analysis

This Table describes IUPAC consensus characters and macth scores used while searching the DNA sequences for conserved TF binding site / cis-elements. The score is '1' for characters encoding single base, '0.5' for characters encoding 2 bases, '0.25' for characters encoding 3 bases, '0.25' for lower case characters (that indicates only prefered base).
 

IUPAC consensus character in the motif Matching base in the DNA sequence
Match Score
A
A
1
T
T
1
G
G
1
C
C
1
R
A or G
0.5
Y
T or C
0.5
W
A or T
0.5
S
G or C
0.5
M
A or C
0.5
K
G or T
0.5
B
T or G or C
0.25
H
A or T or C
0.25
V
A or G or C
0.25
D
A or G  or T
0.25
N
A or T or G or C 
0
a
A
0.25
t
T
0.25
g
G
0.25
c
C
0.25