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