text: Signaling Gateway Molecule Pages is a database containing "essential information on more than 8000 mammalian proteins (Mouse and Human) involved in cellular signaling."
  The content of molecule pages is authored by invited experts and is peer-reviewed. The published pages are citable by digital object identifiers (DOIs). All data in the Molecule Pages are freely available to the public.
  Data can be exported to PDF, XML, BioPAX/SBPAX and SBML.
  MIRIAM Registry Details.