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