Fig. 2.

Illustration of the UTGB framework. The UTGB framework has a two-sided design, client- (browser) and server-side code. For the client side, the UTGB Toolkit generates a web browser interface that consists of a set of tracks. Individual tracks communicate with the web servers, and produce track contents from the received data in the form of, for example, graphics or table data. Track groups, which manage a set of tracks, hold common parameters shared among tracks, such as window location on the genome sequence. On the server side, arbitrary web data sources (e.g. HTML, text, XML, database query results, etc.) can be used to generate track contents using mini-browser (iframe) tracks or web resource adapters. Advanced users can implement tracks in Java, which are compiled into JavaScript code, to provide a more sophisticated user interface.