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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.