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