Western blot was performed using Anti-JunB Polyclonal Antibody (Product # PA5-17263) and a 42kDa band corresponding to JunB was observed across cell lines tested. Fresh nuclear enriched extracts (30 µg lysate) of A-431 (Lane 1), PC-3 (Lane 2) HeLa (Lane 3) and K-562 (Lane 4) were electrophoresed using NuPAGE™ 4-12% Bis-Tris Protein Gel (Product # NP0321BOX). Resolved proteins were then transferred onto a Nitrocellulose membrane (Product # IB23001) by iBlot® 2 Dry Blotting System (Product # IB21001). The blot was probed with the primary antibody (1:1000 dilution) and detected by chemiluminescence with Goat anti-Rabbit IgG (Heavy Chain) Superclonal™ Recombinant Secondary Antibody, HRP (Product # A27036, 1:4000 dilution) using the iBright FL 1000 (Product # A32752). Chemiluminescent detection was performed using SuperSignal™ West Dura Extended Duration Substrate (Product # 34076).