{HEAD ~ Cobratoxin} and alpha bungarotoxin have {TAIL ~ highest affinity} for NAchRs containing the alpha 1 and 7 subunits  
have
{ HEAD ~ Cobratoxin } and alpha bungarotoxin have { TAIL ~ highest affinity } for NAchRs containing the alpha 1 and 7 subunits
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH