Table 3

A Structured Motif

Symbols
M1

M2

M3

A
2
12
17
1
11
1
35
0
24

1
0

3
1
35
C
0
10
8
5
2
0
0
19
0

0
25

5
35
1
G
2
5
5
2
10
34
1
0
0

26
11

0
0
0
T
32
9
6
28
13
1
0
17
12

9
0

28
0
0

IUPAC
D
N
N
N
N
D
R
Y
W

D
S

H
M
M

We aligned the 36 A. thaliana LTR retrotransposons from Repbase Update [2] database which belong to Copia group corresponding to genes encoding reverse transcriptase to obtain the structured motif M1 [2,5] M2 [6,7] M3. Rows 2–5 show the profile (the frequency of observing a DNA base in a given position), and the last row shows the corresponding pattern over the IUPAC alphabet.

Zhang and Zaki Algorithms for Molecular Biology 2006 1:22   doi:10.1186/1748-7188-1-22