NOVELTY - A biocompatible membrane comprises layer(s) of a synthetic polymer material and polypeptide(s). The synthetic polymer material includes polymer(s), copolymer or block copolymer material provided that when the synthetic copolymer material includes block copolymer(s), the polymer material also includes polymer(s) or copolymer.    USE - Fuel cells useful in automotive and electronic industry.    ADVANTAGE - The cell is more stable, longer lived, more durable and able to be placed in a wider range of useful environments. It can operate when in contact with solutions having very different and very extreme pHs on either side, and can be formulated to be stable in the presence of oxidizing and/or reducing agents and is useful at extremes of temperature or other operating and storage conditions. It also facilitates the passage of current to a degree at least greater than that of which would occur using the identical membrane without a polypeptide.    DETAILED DESCRIPTION - A biocompatible membrane comprises layer(s) of a synthetic polymer material having two sides and polypeptide(s) capable of participating in a chemical reaction, participating in the transporting of molecules, atoms, protons, or electrons from the first side to the second side of the layer or participating in the formation of molecular structures that facilitate the reactions or transport. The synthetic polymer material includes polymer(s), copolymer or block copolymer material provided that when the synthetic copolymer material includes block copolymer(s), the polymer material also includes polymer(s) or copolymer.    INDEPENDENT CLAIMS are also included for the following:    (1) a fuel cell comprising an anode compartment with anode, a cathode compartment, and the inventive biocompatible membrane disposed within the anode compartment, within the cathode compartment or between the anode and cathode compartments;    (2) a solution useful for producing a biocompatible membrane.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the transfer of electrons and protons in an anode compartment of a fuel cell.