gene :gene_chembl_id, nomenclature: 'ChEMBL Gene Identifier' do
              names :gene_symbol, nomenclature: 'ChEMBL Gene Symbol', unless: blank_filter
              names :uniprot_id, nomenclature: 'UniProt Accession', unless: blank_filter
              names :uniprot_name, nomenclature: 'UniProt Name', unless: blank_filter
              # target_ligand fields are ignored for now.