Table 1 The structural alphabet of 23 conformational clusters with their associated capital letters and the η and θ pseudo-torsion angles of their center nucleotides

1

A

(161, 215)

9

I

(165, 8)

17

R

(67, 165)

2

B

(173, 243)

10

J

(181, 320)

18

S

(128, 212)

3

C

(201, 200)

11

K

(164, 267)

19

T

(78, 301)

4

D

(173, 166)

12

L

(231, 272)

20

V

(14, 344)

5

E

(200, 143)

13

M

(280, 232)

21

W

(304, 19)

6

F

(225, 108)

14

N

(327, 207)

22

Y

(337, 92)

7

G

(173, 97)

15

P

(4, 240)

23

Z

(256, 159)

8

H

(67, 79)

16

Q

(41, 228)