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Zeta potential (ζ) of synaptosomes from the cerebral cortex after treatment with (a) L-glutamate and (b) kainic acid. Synaptosomes are treated for 30 min at 37 °C. Zeta potential measurements are performed at 25 ± 0.1 °C in 0.05 M Tris-HCl buffer, pH 7.2. Each value is the mean ± SE of three independent preparations. * p < 0.05; ** p < 0.01; *** p < 0.001.
