Casein Tween 20 in PBS

1% Casein with 0.05% Tween-20 in PBS (137mM Sodium Chloride, 2.7mM Potassium Chloride, 1mM Sodium Phosphate, 1.5 Potassium Phosphate), pH 7.4 ± 0.2. Prepared in DI water and filtered. Shipped cold on blue ice, store at 2-8C for short term and -20 for long term.