A 17 kb nucleic acid fragment, which confers production of the lantihiotic cinnamycin on non-producer Strepto-mycete strains, has been isolated from Streptomyces cinnamoneus cinnamoneus DSM 40005 and characterised. Each of the anode and the cathode comprises a catalyst layer in contact with the polymer electrolyte membrane, an electrode supporting material having gas permeability and electronic conductivity, and a water repellent layer interposed between the catalyst layer and the electrode supporting material. The laminations allow bands of color or opacity to create a distinctive appearance.