Use of the term “isolated” indicates that {HEAD ~ a naturally occurring sequence} has been removed from {TAIL ~ its normal cellular environment} 
removed from
Use of the term “ isolated ” indicates that { HEAD ~ a naturally occurring sequence } has been removed from { TAIL ~ its normal cellular environment }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL