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