The modified complexes retain their ability to stimulate interferon release by the cells but are rendered more vulnerable to destruction within the cells, {HEAD ~ the modified complexes} being significantly less toxic than {TAIL ~ the original complexes} 
significantly less toxic than
The modified complexes retain their ability to stimulate interferon release by the cells but are rendered more vulnerable to destruction within the cells , { HEAD ~ the modified complexes } being significantly less toxic than { TAIL ~ the original complexes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL