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Effect of extracellular Ca2+ on the [Ca2+]i increase in cerebellar astrocytes. The [Ca2+]i increase induced by 100 μM ATP (traces a and b) or 100 nM angiotensin II (AGII) (traces c and d) were measured in the presence (traces a and c) or absence (traces b and d) of extracellular Ca2+.
