Assertion: morphine | /r/HasProperty | detected in breast milk
Facets:
Source sentences:
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).