A method of detecting a complementary member of {HEAD ~ a specific binding pair} in {TAIL ~ a sample}, comprising: 
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A method of detecting a complementary member of { HEAD ~ a specific binding pair } in { TAIL ~ a sample } , comprising :
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH