In the article, “MicroRNAs in the Human Heart: A Clue to Fetal Gene Reprogramming in Heart Failure,” by Thum et al (Circulation. 2007;116:258-267:), 2 errors appeared: (1) In Figure 1B, right panel, in the y-axis (“BGA axis2”), “2.0” should read “0.2” and “0.15” should read “0.05.” (2) In the legend for Figure 2, “The exact values are shown in Table III . . .” should have read “The exact values are shown in Table II. . . .” The authors regret these errors.