SDS-PAGE analysis was performed using 10–15% acrylamide gels containing 1% SDS. GST-CTD samples were prepared by boiling with SDS-PAGE loading dye at 95°C for 5 min. This was also used to quench time-course reactions. A volume containing approximately 1 μg of phosphorylated GST-CTD substrate or no kinase control was loaded into wells and resolved at ~150V for 1 hr at room temperature. Gels were stained with Coomassie Brilliant Blue and visualized on G: BOX imaging systems (Syngene).
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