Table 1. Composition of the experimental dataset obtained from RNA STRAND.

Source database	RNA types in sourcedatabase	Secondary structure determinationapproach	No. of sequencesin dataset
RCSB Protein Data Bank (PDB)	Ribozymes, ribosomal RNA, transfer RNA, etc.	NMR, X-ray crystallography with RNAView as secondary structure annotation tool	49
Comparative RNA web site	Ribosomal RNA and intronicRNA	Comparative sequence analysis	821
tmRNA database	Transfer messenger RNA	Comparative sequence analysis	645
RNase P database	Ribonuclease P RNA	Comparative sequence analysis	395
Rfam database	Ribozyme, telomerase RNA,RNase MRP RNA,RNase 5’ UTR	Comparative sequence analysis, phylogenetic analysis, mfold, etc.	29