PseudoBase: structural information on RNA pseudoknots

PseudoBase is a database containing structural, functional and sequence dat a related to RNA pseudoknots. It can be reached at http ://wwwbio.LeidenUni v.nl/ similar to Batenburg/PKB.html. For each pseudoknot, thirteen items ar e stored, for example the relevant sequence, the stem positions of the pseu doknot, the EMBL accession number of the sequence and the support that can be given regarding the reliability of the pseudoknot. Since the last public ation, information on sizes of the stems and the loops in the pseudoknots h as been added. Also added are alternative entries that produce surveys of w here the pseudoknots are, sorted according to stem size or loop size.