After centrifuging the supernatant liquid from {HEAD ~ the precipitation}, the precipitation is washed with a diluted aqueous solution of alcohol, usually ethanol, with {TAIL ~ such a concentration} that the precipitation is not dissolved 
After centrifuging the supernatant liquid from { HEAD ~ the precipitation } , the precipitation is washed with a diluted aqueous solution of alcohol , usually ethanol , with { TAIL ~ such a concentration } that the precipitation is not dissolved
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH