Kangaroo screenshot. A screenshot of Kangaroo query web interface and results page for a search for potential PDZ binding sites. Top panel shows the Kangaroo user interface. The user can select to match the expression to protein, DNA or coding region sequences from 10 different organisms. The bottom panel shows sample search results. Each hit contains a hyperlink to the full GenBank flatfile record. Note the use of regular expression rules and wildcard character "X" to specify the wide range of potential PDZ binding motifs.