Fig. 3: The effect of various concentrations of ethanol (ETOH) and potassium (K) on the release of immunoreactive β -endorphin by the hypothalamus. Bars represent means and standard errors. n = number of distinct experiments. *Significantly different from spontaneous release (p < 0.05). Reproduced from Gianoulakis,⁶⁶ with permission of the publisher.