A method 8, wherein {HEAD ~ the washing medium} is {TAIL ~ the culture medium} used in stage  
is
A method 8 , wherein { HEAD ~ the washing medium } is { TAIL ~ the culture medium } used in stage
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH