Figure 3

Screenshot of the HMPAS showing its main web interfaces. Users can browse the hierarchical structure of membrane protein classes and click to view detailed information of the target class (a). The class information page shows its direct parent and child terms and summarized view of the identified characteristic features of member proteins (b). The HMPAS permits searching via keywords with 6 different fields (c). The information page of the target protein provides its general information, classification annotation, and sequence and functional features in an organized format (d). It also provides a sequence analysis page for searching homologous proteins in the system, extracting sequence features in the query sequence, and predicting novel membrane protein (e).