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Papaverine enhances the spontaneous release of 3H-dopamine from rat brain striatal synaptosomes and 3H-noradrenaline from cortical synaptosomes in a dose-dependent way. Neither dibutyryl cyclic AMP nor theophylline had any significant effect on either spontaneous or on potassium-evoked 3H-catecholamine release. It is suggested that the effect of papaverine(More)
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