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Review Question - QID 214212

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QID 214212 (Type "214212" in App Search)
In an fMRI research study for anxiety, participants are shown distressing or control images during the brain MRI scan. In the anxiety group, there seems to be increased activation of the reticular formation, especially in the area of the posterior rostral pons. Which of the following is the primary neurotransmitter produced by this region?