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receptors may be less associated with relaxation and analgesia because kappa-opioid receptor suppresses mu-opioid receptor activation, and delta-opioid receptor interacts differently with agonists and antagonists. Kappa-opioid receptors are involved in chronic anxiety's perceptual mobilization, whereas delta-opioid receptors induce action initiation, impulsivity, and behavioural mobilization. These differences led some researches to suggest that up- or down-regulations within three opioid receptors families are the basis of different dispositional

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