The composition comprises a polyvalent agent that binds to a highly expressed cell surface antigen present on {HEAD ~ the surface} of {TAIL ~ a cell} 
The composition comprises a polyvalent agent that binds to a highly expressed cell surface antigen present on { HEAD ~ the surface } of { TAIL ~ a cell }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL