| http://www.w3.org/ns/prov#value | - Activation of the opioid and dopaminergic pathways were observed in various areas of the brain, principally in the nucleus accumbens in this study.29 In fibromyalgia, alterations in the pain-inhibiting descending pathways, including the serotoninergic, noradrenergic and possibly dopaminergic and opioid pathways, have been observed.5 Tramadol, an opioid analgesic, has been shown to exert a benefici
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