UNLABELLED: Cytoscape is a popular bioinformatics package for biological network visualization and data integration. Version 2.8 introduces two powerful new features--Custom Node Graphics and Attribute Equations--which can be used jointly to greatly enhance Cytoscape's data integration and visualization capabilities. Custom Node Graphics allow an image to be projected onto a node, including images generated dynamically or at remote locations. Attribute Equations provide Cytoscape with spreadsheet-like functionality in which the value of an attribute is computed dynamically as a function of other attributes and network properties. AVAILABILITY AND IMPLEMENTATION: Cytoscape is a desktop Java application released under the Library Gnu Public License (LGPL). Binary install bundles and source code for Cytoscape 2.8 are available for download from http://cytoscape.org.

This paper describes a Bayesian learning based approach to protein secondary structure prediction. Four secondary structure types are considered, including /spl alpha/-helix, /spl beta/-strand, /spl beta/-turn and coil. A six-letter exchange group is utilized to represent a protein sequence. Training cases are expressed as sequence quaternion. A tool called Predictor is developed in Java that implements the proposed approach. To evaluate the tool, we select, from the protein data bank and based on the principle of one-protein-per-family according to the structure family of SCOP, six hundred and twenty-three known proteins without pair wise sequence homology. Several training/test data splits have been tried. The results show that our proposed approach can produce prediction accuracy comparable to those of the traditional prediction methods. Predictor has user-friendly and easy-to-use GUIs, and is of practical value to the molecular biology researchers.