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