Plasma assays were performed as previously described (31 (link), 36 (link)). Briefly, plasma glucose was measured on a Beckman Analyzer II (Beckman, Fullerton, CA, USA) in rats and on a HemoCue Glucose 201 Analyzer (HemoCue Inc., CA, USA) in mice. Plasma FFA were measured with an enzymatic colorimetric kit (Wako Industries, Neuss, Germany). Radioimmunoassays specific for rat/mouse insulin and C-peptide (Linco, St. Charles, MO, USA) were used to determine their plasma concentrations. All assays were performed in duplicate.
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