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