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IP20 prevents inhibition of IP3-induced Ca2+ release by carbacyclin but not by SNP. IP20 (100 μM), caged IP3 (100 μM), and OGB488 (200 μM) were included in the intrapipette solution. IP3 was released by UV flashes as indicated. Carbacyclin (100 nM) and SNP (0.5 mM) were applied to the cell as indicated.
