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Measurements of intracellular Ca2+ ([Ca 2+ ] c) in isolated brain cells. The resting calcium level in ketamine-treated or saline-treated brain cells was determined fluorometrically by using the Fluo-4 calcium indicator. Statistical differences, tested by the Mann–Whitney U test, between saline-treated (n = 12) and ketamine-treated (n = 12) rats are indicated by *P < 0.05
