def self.source_info
        {
          base_url:           'https://druggablegenome.net/IDGProteinList/',
          site_url:           'https://druggablegenome.net/',
          citation:           'Rodgers,G., Austin,C., Anderson,J., Pawlyk,A., Colvis,C., Margolis,R. and Baker,J. (2018) Glimmers in illuminating the druggable genome. Nat. Rev. Drug Discov., 17, 301–302. PMID: 29348682',