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Time control study for stability of Δ[Ca2+]i during 3 successive KCl (60 mM) applications. Data are Δ[Ca2+]i caused by KCl depolarization at 10 minute intervals. Data were normalized to the first Δ[Ca2+]i response and are mean + s.e.m. Δ[Ca2+]i did not decline significantly over the time course of this protocol (P > 0.05).
