Casein/Tween 20 in TBS

1% Casein with 0.05% Tween-20 in TBS. (50 mM Tris-HCl and 150 mM NaCl, pH 7.4 ± 0.2). Prepared in DI water and filered. Shipped cold on blue ice, store at 2-8 C for short term and -20 C for long term.