Assertion: morphine | /r/HasProperty | detected in human cerebrospinal fluid
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text: Since the time when morphine was first detected in breast milk, cow's milk, and human cerebrospinal fluid, it has been known that it is a natural endogenous neurotransmitter in higher vertebrates, including humans (Amann and Zenk 1996; Cardinale et al. 1987; Hazum et al. 1981).