BSA (5%) in PBST with Azide

5% BSA in 0.05% Tween-20 and 0.02% Sodium azide in PBS (137mM Sodium Chloride, 2.7mM Potassium Chloride, 1mM Sodium Phosphate, 1.5 Potassium Phosphate), pH 7.4 ± 0.1. Filtered through 1-micron filter. Shipped RT, store 2-8C for long term.