{HEAD ~ These portions} of {TAIL ~ Toxins A} and B may be fusion proteins with at least one non toxin protein sequence, and may also be soluble and substantially endotoxin free 
{ HEAD ~ These portions } of { TAIL ~ Toxins A } and B may be fusion proteins with at least one non toxin protein sequence , and may also be soluble and substantially endotoxin free
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH