A BRCA1-retrieved HPD pathway-pathway similarity matrix. This is an interactive heat map containing similarity scores among the pathways involving query protein(s) or gene name(s). The tooltip shows the two pathway IDs and names corresponding to the particular cell pointed to along with their similarity score. A right click context menu shows the links (HPD_644 and HPD_340) to a Web page containing pathway information (as shown in Figure 2d). The "Compare HPD_644 against HPD_340" option will redirect to a page with a pathway-protein matrix showing proteins shared by these two pathways. The legend above the map indicates the range of similarity score (0 to 1).