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Opioid receptors and enkephalinergic neurons in the central nervous system of Mytilus edulis have been reported. Also known is that the lateral epithelium of the gill is innervated by serotonergic, cilioexcitatory neurons and dopaminergic, cilioinhibitory neurons. The aim of the present report is to look for an effect of opioid agonists on the nervous(More)
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