Of note, reduced Hdac6 transcript levels in pAF or cAF patients with concomitant LV dysfunction as well as in HL‐1 cells subjected to 24 h of tachypacing are in contrast to increased Hdac6 protein levels reported previously in the same in vitro system after 4–8 h tachypacing and in AF patients with undisclosed LV function (Zhang, Wu, et al., 2014). The gene discussed is HDAC6; the disease is atrial fibrillation.