The term determinant is used here in a broad sense to denote that portion of the biological entity involved in and responsible for selective binding to {TAIL ~ a specific binding substance}, the presence of which is required for {HEAD ~ selective binding} to occur 
The term determinant is used here in a broad sense to denote that portion of the biological entity involved in and responsible for selective binding to { TAIL ~ a specific binding substance } , the presence of which is required for { HEAD ~ selective binding } to occur
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH