Since {HEAD ~ the second reagent} 17 is directed toward {TAIL ~ the first reagent}, the amount of liquid reagent necessary to wet the first reagent 13 is reduced and the remainder of the test pad 12 may remain substantially dry 
is directed toward
Since { HEAD ~ the second reagent } 17 is directed toward { TAIL ~ the first reagent } , the amount of liquid reagent necessary to wet the first reagent 13 is reduced and the remainder of the test pad 12 may remain substantially dry
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL 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