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