Mice Can Synthesize Their Own Morphine

http://www.sciencedaily.com/releases/2010/05/100506165907.htm

ScienceDaily (May 6, 2010) — Traces of morphine in urine samples have been considered a clear proof of drug use or the consumption of food containing poppy in the past. Now a study by a team of scientists from the Institute of Environmental Research at TU Dortmund and the Donald Danforth Plant Science Center in St Louis, Missouri, point to another possible explanation: they managed for the first time to prove that mice -- and probably humans and other mammals as well -- produce their own morphine in their bodies.

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