In order to exclude that KIR2.1‐GFP accumulation in response to amiodarone and dronedarone is cell type specific or depends on the GFP tag, we made use of mouse P19 embryonal carcinoma‐derived END‐2, MES‐1 and EPI‐7 cells representing the three different germ layers 34 that were transiently transfected with non‐tagged human KIR2.1. Here, KCNJ2 is linked to embryonal carcinoma.