The Pfam protein families database.
Alex BatemanLachlan James M. CoinRichard DurbinRobert D. FinnVolker HollichSam Griffiths-JonesAjay KhannaMhairi MarshallSimon MoxonErik L. L. SonnhammerDavid J. StudholmeCorin YeatsSean R. EddyPublished in: Nucleic Acids Res. (2004)