b) allowing sufficient time for the dye conjugate to form a complex with the complementary member, said {HEAD ~ complex} exhibiting {TAIL ~ a detectable optical response}; and 
exhibiting
b ) allowing sufficient time for the dye conjugate to form a complex with the complementary member , said { HEAD ~ complex } exhibiting { TAIL ~ a detectable optical response } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH