are mainly found in the brain and gastrointestinal tract

[Solved] Opioid peptides:

Q.	Opioid peptides:
A.	are not formed from precursors
B.	include morphine as an example
C.	form the opioid receptors in the brain
D.	are mainly found in the brain and gastrointestinal tract
E.	are almost always excreted unchanged
Answer» D. are mainly found in the brain and gastrointestinal tract

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