Next, {HEAD ~ the nucleic acid} bound to {TAIL ~ the substrate} is contacted with a first type of nanoparticles having oligonucleotides attached thereto 
Next , { HEAD ~ the nucleic acid } bound to { TAIL ~ the substrate } is contacted with a first type of nanoparticles having oligonucleotides attached thereto
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH