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“The β‐adrenergic agonist isoproterenol (ISO) used at concentrations up to 10−6 M induced a moderate (+20–40%) increase in intra‐ and extracellular 5‐HT levels together with a large release of melatonin.”
“Various adrenergic antagonists inhibited the stimulation due to 10 −5 M l -NA with IC 50 values of order of potency phentolamine > phenoxybenzamine > d .”