{HEAD ~ The toxicity} of {TAIL ~ these molecules} is based upon their relative affinity for the receptor which far exceeds that of acetylcholine 
of
{ HEAD ~ The toxicity } of { TAIL ~ these molecules } is based upon their relative affinity for the receptor which far exceeds that of acetylcholine
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 OTH