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