A comparison of HPD "Multiple Protein Search" feature with those in Panther and KEGG. The example shows that different pathway databases retrieved different numbers of pathways. Three genes (AURKA, BRCA1, and FOXA1) were used to build this example. The KEGG database returned only one pathway in the result. Panther returned four pathways. HPD returned 25 pathways. The difference is primarily due to the use of "similar pathways" concept to allow retrieval of pathways that matched only partial gene/protein list.