Since the first discovery of RNA pseudoknots more and many more pseudoknots have been found. However, not all of those pseudoknot data are easy to trace. Sometimes the information is hidden in a publication where the title gives no hint that pseudoknot information is there. This was the first reason that we thought that a general accessible information source for pseudoknots would be handy.
Pseudobase is covered by Thomson Reuters Data Citation Index. Using the simple structure of PseudoBase, Texas university designed a new shell around the data of PseudoBase for improved access. It provides more extensive and improved searching capabilities and more and better presentations for viewing the knotted RNA's. PseudoBase++ is reached at http://pseudobaseplusplus.utep.edu.