Cytokine concentrations. Median (± IQR) plasma levels of TNF-α (A), IL-6 (B), IL-8 (C), and IL-10 (D) after LPS administration (4 ng/kg intravenously, T = 0 hours), during one of the following conditions: an L_insuE_gluc clamp (□), an L_insuH_gluc clamp (○), an H_insuE_gluc clamp (■), and an H_insuH_gluc clamp (●). P = NS.