TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The polypeptide can participate in transporting protons from the first side to the second side of the layer and/or can facilitate the passage of current across the layer to a degree at least greater than that which would using an identical biocompatible membrane without the polypeptide. It can participate in transporting protons from the first side to the second side to be capable of providing at least 10 picoamps/cm2 or at least 10 milliamps/cm2 current density. It is embedded in the layer. It can also participate in a redox reaction. The block copolymer has a hydrophobic content exceeding its hydrophilic content. The synthetic polymer material is a mixture of block copolymers.The polypeptide can participate in a redox reaction and/or in the transporting of molecules, atoms, protons or electrons from the first side to the second side of the layer or from the anode side to the cathode side of the layer.Preferred Composition: The polypeptide is present in at least 0.01, preferably at least 10 wt.% of the membrane. The block copolymer is provided in at least 50-99 wt.% based on weight of the membrane. At least one detergent is present in 0.01-1 volume/volume %. The synthetic polymer material is present in 1-30 wt./volume % and the polypeptide is present in 0.001-10 wt./volume %.Preferred Property: The block copolymer has block(s) with an average molecular weight of 1,000-15,000 Daltons, and at least a second block having an average molecular weight of 1,000-20,000 Daltons.Preferred Cell: At least one second polypeptide within the anode compartment capable of liberating protons or electrons from an electrode carrier.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The fuel is an organic compound.    TECHNOLOGY FOCUS - ELECTRONICS - Preferred Property: The anode and cathode are placed into electrical contact though a circuit to generate 10, preferably 100 milliwatts/cm2. The pH of the anode compartment is at least 0.5 or at least 2 pH units higher than the pH of the cathode compartment. It is preferably at least 8 and the pH of the cathode compartment is at most 5.Preferred Component: The cell further comprises at least one transfer mediator within the anode compartment capable of transferring electrons to the anode. At least one biocompatible membrane is disposed between the anode and cathode. EXAMPLE - A biocompatible membrane was formed across apertures of a dielectric perforated support using PEG 8000/PROTOLYTE A700 (RTM) membrane. A final solution containing a block copolymer, stabilizing polymer and polypeptide was deposited on the substrate to completely cover the apertures. The membrane was sealed in place within a fuel cell with rubber gaskets to form two chambers, and anode and cathode compartments. The anode and cathode compartments were filled with aqueous electrolyte. The membrane was stable for circa 3 days and the peak current density was 158 mA/cm2.