Table 3.

Summary of the number of different base pair types in the PDB and RNAstrand data sets used for benchmarking RNA 2D prediction methods

Base pair	PDB data set		RNAstrand data set
	‘Standard’ base pair counts	‘Extended’ base pair counts	‘Extended’ base pair counts
CG	2716	3023	119 146
AU	957	1291	69 220
GU	418	541	26 525
AG	0	637	4606
AA	0	192	1502
AC	0	150	2352
GG	0	113	733
UU	0	85	1975
CU	0	73	1225
CC	0	41	553