Life sciences
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Although mu opioids share many pharmacological characteristics, they also reveal many differences. Many approaches over the years have suggested the existence of multiple mu opioid receptors. ⋯ The cloning of a mu opioid receptor, MOR-1, provided a way of exploring this possibility at the molecular level. Recent studies have now identified a number of splice variants of this gene that appear to be important in the production of mu opioid analgesia.