This further aids in the separation of contaminants and improves {HEAD ~ the performance} of {TAIL ~ the assay} 
of
This further aids in the separation of contaminants and improves { HEAD ~ the performance } of { TAIL ~ the assay }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL