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In 84% of substantia gelatinosa (SG) neurones examined in adult rat spinal cord slices, an anandamide transport inhibitor, AM404, increased the frequency of spontaneous excitatory postsynaptic currents in a manner similar to that of capsaicin. AM404 was without actions in the presence of a vanilloid TRPV1 receptor antagonist, capsazepine. We conclude that AM404 enhances the spontaneous release of l-glutamate by activating TRPV1 receptors in the SG.