“…MEF DNA was prepared as described (
Aoidi et al, 2016 ). Purified DNA was digested with the Nhe I and Sbf I restriction endonucleases, fractionated by pulse field gel electrophoresis through 1% agarose gel, which was conducted in 0.5× TBE buffer (45 mM Tris-base, 1 mM EDTA, 45 mM boric acid) with a CHEF DR-II apparatus (Bio-Rad, Hercules, CA), with an initial switch time at 1 s and final switch time at 10 s for 20 h at 14°C and a voltage of 10 V/cm (
Herschleb et al, 2007 ;
Jo et al, 2013 ). The gel was blotted onto N-Hybond membrane (GE Healthcare Life Sciences, Mississauga, ON, Canada), and hybridized to probe d described in
…”