{HEAD ~ An assay device} for detection and {TAIL ~ determination} of an analyte in a test sample uses a barrier containing an aperture to control the application of reagents to the device for greater reproducibility of results 
{ HEAD ~ An assay device } for detection and { TAIL ~ determination } of an analyte in a test sample uses a barrier containing an aperture to control the application of reagents to the device for greater reproducibility of results
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