For many binding assay formats, {HEAD ~ a labeling agent} is needed in addition to the binding agent and binding partner to determine whether {TAIL ~ the two binding substances} actually bind to each other 
For many binding assay formats , { HEAD ~ a labeling agent } is needed in addition to the binding agent and binding partner to determine whether { TAIL ~ the two binding substances } actually bind to each other
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 OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH