Hela Nuclear Extract (Dtt-Free) 1mg. Hela Nuclear Extract (Dtt-Free), Contents- 20 ul (100 ug) or 200 ul (1 mg) of HeLa Nuclear Extract (5 mg/ml) in 20 mM Hepes (pH 7.8), 100 mM KCl, 1 mM MgCl2, 20% Glycerol, and 1 mM PMSF. Application: Western blot- 10-20 ug/lane, Size: 1mg