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