Expression of Ca2+-calmodulin-dependent protein kinase II (CaMKII) and catalytic subunits of protein phosphatases PP1 and PP2A (PP1-C and PP2A-C). Immunoblot analysis was performed using homogenates of ventricles (A-D) or myofibrillar fractions (E,F) from 2.5-month-old male WT, TM180 (TG), and TM180/AE3 (TG/KO) mice. Representative immunoblots and relative expression levels are shown for (A) CamKII, (B) PP1-C, (C) total PP2A-C (non-methylated and methylated), (D) non-methylated form of PP2A-C, (E) total (non-methylated and methylated) PP2A-C associated with the myofribrillar fraction, (F) non-methylated PP2A-C associated with the myofribrillar fraction. n = at least 6 male mice of each genotype. *p < 0.05 vs WT; †p < 0.05 vs TG.