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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