The method used to introduce {TAIL ~ these genes} could be methods described in the art such as electroporation, {HEAD ~ lipofectine}, lipofectamine or other 
The method used to introduce { TAIL ~ these genes } could be methods described in the art such as electroporation , { HEAD ~ lipofectine } , lipofectamine or other
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH