Casein Tween 20 in PBS

1% Casein with 0.05% Tween-20 in PBS (10 mM Sodium phosphate, 2mM potassium phosphate, 10 mM KCl, 137 mM NaCl), pH 7.4 ± 0.2. Prepared in 3D water and filtered. Shipped cold on blue ice, store at 2-8C for short term and -20 for long term.