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