National Geographic Scientists are beginning to decode how and why mammals, including humans, produce tiny amounts of morphine naturally. One theory is that in times of intense injury, pain is blocked enough for a mammal to escape to safety. If so, could this have been a key factor in mammalian survival and evolution?
news.nationalgeographic.com
Tiny amounts of the "incredible painkiller" get made naturally in mice and people, possibly as a defense mechanism, a new study says.
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