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Scatterplots illustrate individual β2*-nAChR availability (VT/fP) in recently abstinent tobacco smokers (n = 24) in the thalamus (filled triangle), striatum (filled circle), cerebellum (filled inverted triangle), and cortex (average of parietal, frontal, anterior cingulate, temporal, and occipital regions; filled square) as a function of percent change in pain sensitivity and pain tolerance measured from the first to second cold pressor task.
