In an additional embodiment, a composition is provided for permeabilizing a cell, comprising a polyvalent agent that binds to {HEAD ~ a highly expressed cell surface antigen present} on {TAIL ~ the surface} of a cell 
In an additional embodiment , a composition is provided for permeabilizing a cell , comprising a polyvalent agent that binds to { HEAD ~ a highly expressed cell surface antigen present } on { TAIL ~ the surface } of a cell
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH