In the article, "Control of In Vivo Contraction/Relaxation Kinetics by Myosin Binding Protein C: Protein Kinase A Phosphorylation–Dependent and –Independent Regulation" by Nagayama et al that published in the November 20, 2007, issue (Circulation. 2007;116:2399-2408), the phrase "left ventricular" was omitted from the title. The full title should read, "Control of In Vivo Left Ventricular Contraction/Relaxation Kinetics by Myosin Binding Protein C: Protein Kinase A Phosphorylation–Dependent and –Independent Regulation."

The authors regret this error.