A biosensor 18 in which the first second receptor moieties are {HEAD ~ Fab fragments} which recognize {TAIL ~ different antigenic determinants} 
recognize
A biosensor 18 in which the first second receptor moieties are { HEAD ~ Fab fragments } which recognize { TAIL ~ different antigenic determinants }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL