a synthetic opioid that is up to three times more potent than fentanyl. "We will not allow drug dealers to hide behind novel ...

Data from the Centers for Disease Control and Prevention show there were about 107,000 drug overdose deaths in the United States in 2023. Of those, about 75%, or 81,000, involved opioids.

Now two independent research teams have produced high-resolution atomic structures of the mu-opioid receptor (µ-OR), which recognizes morphine and codeine, and the kappa-opioid receptor (?-OR), the ...