keywords: morphine opium painkiller cells tissue
text: Human Cells Make Morphine By Steven Reinberg, HealthDay Reporter    HealthDayNews -- Morphine, a potent painkiller typically derived from the opium poppy plant, appears to be made by the human body as well.    Small amounts of morphine have been found in animal tissue before, but researchers had assumed these traces came from environmental contamination, such as a diet...