Holliday junction
... that the DNA Holliday junction was originally studied for its role in genetics, and was later used as a basic structural element in DNA nanotechnology?
... that the DNA <b id="mwA2w"><a href="./Holliday_junction" id="mwA20" rel="mw:WikiLink" title="Holliday junction">Holliday junction</a></b> <i id="mwA24">(schematic pictured)</i> was originally studied for its <a href="./Homologous_recombination" id="mwA28" rel="mw:WikiLink" title="Homologous recombination">role in genetics</a>, and was later used as a basic structural element in <a href="./DNA_nanotechnology" id="mwA3A" rel="mw:WikiLink" title="DNA nanotechnology">DNA nanotechnology</a>?