providing {TAIL ~ a retainer} with {HEAD ~ a plurality} of compartments, wherein a first compartment comprises a first antibody and a second compartment comprises a second antibody 
providing { TAIL ~ a retainer } with { HEAD ~ a plurality } of compartments , wherein a first compartment comprises a first antibody and a second compartment comprises a second antibody
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH