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Abstract. We have previously investigated the effects of extracellular ATP on the concentration of free cytosolic calcium ([Ca2+]i) from rat cultured neurohypophysial astrocytes (pituicytes). We demonstrated that ATP acts via a P2Y receptor to increase [Ca2+]i. In the present study, we examine the effect of ATP on K+ efflux using 86Rb+ as an isotopic tracer, in order to characterize the possible presence...
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