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Characterization of sustained Ca2+ influx in ET-1-stimulated somatotrophs.A, B, The effects of extracellular Ca2+, added during sustained ET-1 stimulation, on [Ca2+]i in control (A) and pertussis toxin-treated (B) cells. C, Nifedipine sensitivity of ET-1-induced plateau [Ca2+]i transients in pertussis toxin-treated somatotrophs.
