UNLABELLED: The database of known protein structures contains an overwhelming number of structural similarities that frequently point to intriguing biological relationships. The similarities are often difficult to spot, and once detected their comprehension needs proper visualization. Here we introduce the new concept of a Fold Space Navigator, a user interface enabling the efficient navigation through fold space and the instantaneous visualization of pairwise structure similarities. AVAILABILITY: The Fold Space Navigator is accessible as a public web service at http://services.came.sbg.ac.at

UNLABELLED: The database SCOP (Structural Classification Of Proteins) has become a major resource in bioinformatics and protein science. A particular strength of SCOP is the flexibility of its rules enabling the preservation of the many details spotted by experts in the classification process. Here we endow classic SCOP Families with quantified structural information and comment on the structural diversity found in the SCOP hierarchy. AVAILABILITY: Quantified SCOP (QSCOP) is available as a public WEB service. http://services.came.sbg.ac.at.