{HEAD ~ The column} may be closed at {TAIL ~ the ends} and shaken and washed with an enzymatic buffer 
closed at
{ HEAD ~ The column } may be closed at { TAIL ~ the ends } and shaken and washed with an enzymatic buffer
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH