DNase I SIM sequence data from Arabidopsis thaliana seedlings
Arabidopsis seeds were surface sterilized in 12 % (w/v) bleach/0.1 % Tween 20 solution and washed extensively with sterile distilled water. Seeds were vernalized for 3 days at 4 °C in water, sown in two parallel rows on MS/agar plates (30 mM sucrose, 4.2 g Murashige and Skoog medium, and 0.8 % Phytagar, pH 5.8) covered with a 100 micron nylon membrane (Genesee Scientific). Seedlings were grown on vertical plates in the Conviron PGR15 growth chamber (12:12 h. light:dark, 21 °C, 50 % humidity, and 250 μmol/m 2 /s light intensity). Roots and leaves of 1 week old seedlings were dissected using surgical blade, flash-frozen in liquid nitrogen, and stored at −80 °C.