Concentrations of mouse and recombinant human FGF21 in plasma were determined by specific ELISAs according to the procedure recommended by the manufacturer (no. RD291108200R, mouse and rat FGF-21 ELISA; no. RD191108200R, human FGF21 ELISA; BioVendor, Brno, Czech Republic) and as described previously [3 (link), 4 (link)]. Plasma insulin concentrations were determined with an ELISA (80-INSMSU-E01; ALPCO Diagnostics, Salem, NH, USA) [37 (link)].
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