The Pfam protein families database.
Marco PuntaPenny C. CoggillRuth Y. EberhardtJaina MistryJohn G. TateChris BoursnellNingze PangKristoffer ForslundGoran CericJody ClementsAndreas HegerLiisa HolmErik L. L. SonnhammerSean R. EddyAlex BatemanRobert D. FinnPublished in: Nucleic Acids Res. (2012)