A hydrophobic, porous, oxygen permeable layer is positioned between the reagent layer and the support, {HEAD ~ such that oxygen} can permeate to {TAIL ~ the layer} containing oxidase 
permeate to
A hydrophobic , porous , oxygen permeable layer is positioned between the reagent layer and the support , { HEAD ~ such that oxygen } can permeate to { TAIL ~ the layer } containing oxidase
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 OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH