Examples of functional units that may be coupled to {HEAD ~ nucleic acids} include chemically reactive groups, photoreactive groups, active site directed compounds, lipids, biotin, proteins, {TAIL ~ peptides} and fluorescent compounds 
Examples of functional units that may be coupled to { HEAD ~ nucleic acids } include chemically reactive groups , photoreactive groups , active site directed compounds , lipids , biotin , proteins , { TAIL ~ peptides } and fluorescent compounds
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH