The metabolic activity of a specific region of the living rat brain can be revealed by
A) MRI scans.
B) CT scans.
C) autoradiography of ghrelin concentration.
D) measurement of Fos protein concentration.
E) EEG recordings.
Answer: D
Rationale: The metabolic activity of a specific region of the living rat brain can be revealed by measurement of Fos protein concentration.
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