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Effect of ET-18-OCH3 on internal Ca2+ stores. (A) ET-18-OCH3 (25 μM) was added at 30 s followed by thapsigargin (1 μM) at 350 s. (B) Thapsigargin (1 μM) was added at 30 s, followed by ATP (0.1 mM) and ET-18-CH3 (25 μM) at 630 s and 760 s, respectively. These experiments were performed in Ca2+-free medium. Traces are typical of 3–4 experiments.
