The method 1, wherein {HEAD ~ the plant sample} is sonicated for {TAIL ~ less than 60 seconds} 
is sonicated for
The method 1 , wherein { HEAD ~ the plant sample } is sonicated for { TAIL ~ less than 60 seconds }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL