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. 2002 Jan 17;3:2. doi: 10.1186/1471-2105-3-2

Table 5.

Attributes for the "RNA Structure Query System." The 5' and 3' ends of helices and loops are based on the global orientation determined from the 5' and 3' ends of the entire RNA molecule.

RNA Types 5S rRNA, 16S rRNA, 23S rRNA, Group I intron
Phylogenetic Groups / Cell Locations Bacteria (nucleus), Archaea (nucleus), Eucarya (nucleus, mitochondria, and chloroplast)
number/type of nucleotides structural element short name brief explanation (if necessary)

single nuc total
paired (helix) paired positions
unpaired (loop) unpaired positions
5' helix end 5' end of helix
3' helix end 3' end of helix
5' loop end 5' end of loop
3' loop end 3' end of loop
helix center in helix but not at the 5' or 3' ends
loop center in loop but not at the 5' or 3' ends
unpaired/paired ratio of 'unpaired' / 'paired'

adjacent nucs total
in helix paired positions
in loop unpaired positions
3'helix 5'loop junction: 3' end ofhelix/5' end of loop
3'loop 5'helix junction: 3' end ofloop/5' end of helix
in loop/in helix ratio 'in loop' / 'in helix'

base pairs total
5'helix end at the 5' end of a helix
3'helix end at the 3' end of a helix
helix center in helix, but not at the 5' or 3' ends

three nucs total
000, 111,001,011,010, 100, 101,110 0 = unpaired, 1 = paired; patterns of three consecutive nucleotides
5'-(A:C)B base pair with an unpaired nucleotide 3' to one paired position
5'-A(B:C) base pair with an unpaired nucleotide 3' to one paired position

four nucs total
0000,1111,0001, 1110,0010, 1101,0011,1100,0100, 1011, 0101,1010,0110, 1001, 1000, 0111 0 = unpaired, 1 = paired; patterns of four consecutive nucleotides
double pair@5end two consecutive base pairs at the 5' end of helices
double pair@mid two consecutive base pairs not at the 5' or 3'ends of helices
double pair@3end two consecutive base pairs at the 3' end of helices
5-(A:D)BC base pair with two consecutive unpaired nucleotides 3' to one paired position
lonepair base pair with unpaired nucleotides 5' and 3' to one unpaired position
5-AB(C:D) base pair with two consecutive unpaired nucleotides 5' to one paired position