This can involve {HEAD ~ either synergistic positive induction} of {TAIL ~ neuronal cells} by N, or negative modulation by delta N—C for example  
of
This can involve { HEAD ~ either synergistic positive induction } of { TAIL ~ neuronal cells } by N , or negative modulation by delta N — C for example
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH