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