{HEAD ~ The targeting complexes} are further specific for {TAIL ~ agent delivery} through receptor pathways to neuronal membranes or to astroglial cells 
are specific for
{ HEAD ~ The targeting complexes } are further specific for { TAIL ~ agent delivery } through receptor pathways to neuronal membranes or to astroglial cells
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH