A fuel cell system 14, wherein the first electrode of each fuel cell is in contact with {HEAD ~ reactant permeable region} of {TAIL ~ the associated substrate} 
of
A fuel cell system 14 , wherein the first electrode of each fuel cell is in contact with { HEAD ~ reactant permeable region } of { TAIL ~ the associated substrate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL