Scientists have known for decades that opioids relieve pain by binding to molecular switches in the brain called mu-opioid (pronounced “mew-opioid”) receptors. What they didn’t know — until now — was exactly what happens…

Scientists have known for decades that opioids relieve pain by binding to molecular switches in the brain called mu-opioid (pronounced “mew-opioid”) receptors. What they didn’t know — until now — was exactly what happens…