A method in {TAIL ~ accordance} 1, wherein {HEAD ~ the ion exchange column} is a cation exchange column 
A method in { TAIL ~ accordance } 1 , wherein { HEAD ~ the ion exchange column } is a cation exchange column
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH