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