Gene expression in cross-bred mouse hearts as assessed by slot blot of RNA extracted from left ventricular myocardium. All signals were normalized to GAPDH expression and are shown as fold of NTG. (a) HCM × β2AR mice (NTG, n = 8; HCM, n = 10; β2AR, n = 6; HCM/β2AR, n = 4). (b) HCM × βARKct mice (NTG, n = 9; HCM, n = 10; βARKct, n = 10; HCM/βARKct, n = 11). (c) HCM × PLB-null mice (NTG, n = 10; HCM, n = 9; PLB-null, n = 10; HCM/PLB-null, n = 10). AP < 0.05 vs. NTG; ANOVA. BP < 0.01 vs. NTG; ANOVA. CP < 0.05 vs. HCM; ANOVA.