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