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Long-term exposure to elevated extracellular potassium induces BDNF release from newborn NPG neurons in culture. Mean BDNF levels were measured with standard ELISA and ELISA in situ in sister cultures grown for 72 hr in the absence (Control, gray bars) or presence of 40 mmpotassium (KCl, black bars). n = 21; ***p < 0.001; n.s., not significant.
