Watson ati Francis Crick, idimu DNA gbogbo awon irueda ni awon ewon onilopo meji ti ikookan won lo ipo kanna ka, ti ikookan won si ni ite 34 Angstrom (3.4 nanometres) ati itanka 10 Angstrom (1.0 nanometres).. 
If the DNA is twisted in the direction of the lóríx, this is positive supercoiling, and the bases are held more tightly together.. 