Database resources of the National Center for Biotechnology Information.
David L. WheelerDeanna M. ChurchAlex E. LashDetlef D. LeipeThomas L. MaddenJoan U. PontiusGregory D. SchulerLynn M. SchrimlTatiana A. TatusovaLukas WagnerBarbara A. RappPublished in: Nucleic Acids Res. (2001)