Figure 1. The effects of potassium chloride, glutamate, and propofol on basal arginine vasopressin (AVP) release from rat supraoptic nucleus slice preparations. (A) Basal AVP release and AVP release stimulated by 50 mM potassium chloride for 2 min. (B) Basal AVP release and AVP release stimulated by 10-3M glutamate for 2 min. (C) Basal AVP release and AVP release in response to 10-4M propofol for 2 min. Results are the mean +/- SD, for n = 8 (A), n = 10 (B), and n = 6 (C). **Significant (P < 0.01) by a paired Student t test. Potassium chloride was replaced with equimolar sodium chloride.