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