Keep as concentrated solution. Positive Control: HepG2, A549, H1299, Huh-7 (untreated), Huh-7 (3 μM Thapsigargin treatment for 12 hr), Huh-7 (3 μM Thapsigargin treatment for 24 hr), HepG2 (3 μM Thapsigargin treatment for 12 hr), HepG2 (3 μM Thapsigargin