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Table 2 Statistical information about the structural elements stored in RNA FRABASE 2.0.

From: RNA FRABASE 2.0: an advanced web-accessible database with the capacity to search the three-dimensional fragments within RNA structures

Type of structural element

Number of structural elements in all models of the deposited structures

Number of structural elements in the 1st model of the deposited structures

Residue

866720

742632

Base pair

505900

443962

Multiplet:

  

   -triplet

25669

23645

   -quadruplet

3806

3523

   -quintuplet

97

97

Dinucleotide step

332564

270986

Stem

50873

42297

Loop:

  

   -hairpin

21115

16650

   -internal/bulge

34204

29193

   -3-way junction

4117

4077

   -4-way junction

1975

1944

   -5-way junction

1196

1196

   -6-way junction

175

175

   -7-way junction

214

214

   -8-way junction

23

23

   -9-way junction

3

3

   -10-way junction

9

9

   -11-way junction

23

23

   -12-way junction

5

5

   -14-way junction

1

1