In preferred embodiments, {HEAD ~ the serum samples} are fractionated via {TAIL ~ anion exchange chromatography} 
are fractionated via
In preferred embodiments , { HEAD ~ the serum samples } are fractionated via { TAIL ~ anion exchange chromatography }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL