title: Is pyrroloquinoline quinone a cofactor derived from an undiscovered vitamin?
mesh_terms: D003067:Coenzymes; D045542:PQQ Cofactor; D011804:Quinolines; D014815:Vitamins
chemical_list: D003067:Coenzymes; D011804:Quinolines; D014815:Vitamins; D045542:PQQ Cofactor