NR2E3 and atrial fibrillation: It is noteworthy that the variance in the number of AF spots in rd7 mice (Fig. 1E) and rd7/rd7;Tg/Tg mice treated with vehicle (Fig. 5J) might not be identical because of an effect of the genetic background and/or the use of ethanol as a vehicle for AP20187 intraperitoneal injection.