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Human brown adipose tissue detected by fluorodeoxyglucose (FDG)-positron emission tomography (PET). FDG uptake into adipose tissue at the supraclavicular and paraspinal regions is detected by PET. The FDG uptake into adipose tissues is negligible under a warm condition at 27℃ (A), but increases greatly after exposure to cold at 19℃ (B) for 2 hours.
