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