{TAIL ~ The sonication duration} is less than 15 minutes, {HEAD ~ preferably less than 6 minutes more preferably 60 seconds} or less 
{ TAIL ~ The sonication duration } is less than 15 minutes , { HEAD ~ preferably less than 6 minutes more preferably 60 seconds } or less
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH