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