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Correlation between serum TGF-β1 levels and glucose metabolism in patients at asymptomatic and symptomatic HD stages. The relation between serum TGF-β1 levels and glucose metabolism in the caudate nucleus of asymptomatic and symptomatic HD patients is shown in (A) and (B), respectively. Note that a positive correlation is found only in asymptomatic patients (n= 23, R2= 0.31, P= 0.026).
