(A) H1299 neo and HA‐BCL‐2b5 cells treated with either CTRL or NAF‐1 shRNA were loaded with Fura‐2AM, and ER Ca2+ stores were measured as the difference in cytoplasmic Ca2+ concentration before and after addition of TG (2 μM). Shown are representative traces of Fura‐2AM fluorescence measured at 340/380 nm excitation wavelength ratio at 510 nm wavelength emission. Arrow indicates time at which TG was added, delta values indicate TG‐sensitive ER Ca2+ stores. 