Effects of CK2 inhibition on CSQ2 kinase activity. Measurements of CSQ2 kinase activities were carried out as described in Experimental procedures using equivalent amounts of activity from cardiomyocytes (closed circles), COS cells (closed squares), or pure CK2α (open circles). Reactions included 0, 2, 5, 10, 20, 50 and 100 μM concentrations of the CK2 inhibitors TBB (a), DMAT (b) or TBCA (c) (structures shown in respective insets). Activities are shown (y-axis) as percent of control (untreated)