Upon passage of a moisture donating {HEAD ~ fluid} through {TAIL ~ the inactive region} of the device flowpath, at least some of the water contained therein passes through the water transport unit to a portion of the fuel cell that is in need of humidification 
through
Upon passage of a moisture donating { HEAD ~ fluid } through { TAIL ~ the inactive region } of the device flowpath , at least some of the water contained therein passes through the water transport unit to a portion of the fuel cell that is in need of humidification
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH