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