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