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