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Upon two repetitive deep injections of Ca 2+ into Xenopus oocyte (200-300 μn under the membrane), the amplitude of the transient Cl - current induced by the second injection is several-fold higher than that of the first one. This 'potentiation' persists even at 60-90 min intervals between injections. However, in oocytes permeabilized to Ca 2+ by the ionophore A23187...
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