They called this molecule "enkephalin"(meaning "in the head"). It had some of the qualities of morphine, which helped answer the question of why the brain had receptors for morphine. Hughes ...

Over the past few decades, the opioid epidemic has gripped the United States, fueled in large part by the over-prescription ...

Morphine, heroine and other narcotic agonists, act by attaching to receptors in the brain. Naloxone, whose molecular structure is very similar to morphine, attaches itself even more strongly than ...