Functional unit may be added which covalently react and couple the ligand to {TAIL ~ the target molecule}, catalytic groups may be added to aid in the selection of {HEAD ~ protease or nuclease activity}, and reporter molecules such as biotin or fluorescein may be added for use as diagnostic reagents 
Functional unit may be added which covalently react and couple the ligand to { TAIL ~ the target molecule } , catalytic groups may be added to aid in the selection of { HEAD ~ protease or nuclease activity } , and reporter molecules such as biotin or fluorescein may be added for use as diagnostic reagents
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH