Whole blood was mixed with EDTA-2Na (2 mg/ml) and aprotinin (500 kIU/ml) to determine the plasma levels of FGF15, 5-HT, and insulin. Plasma insulin were measured by enzyme-linked immunosorbent assay (mouse Insulin ELISA Kit [TMB], AKRIN-011T, Shibayagi, Gunma, Japan) as described previously (12 (link)). Plasma levels of FGF15 were measured by enzyme-linked immunosorbent assay (mouse FGF15 ELISA kit, CSB-EL522052MO, WUHAN HUAMEI BIOTECH Co). Plasma 5-HT levels were measured by enzyme-linked immunosorbent assay (mouse 5-HT; BA E-5900, Labor Diagnostika Nord, Nordhorn, Germany). Blood glucose levels were measured using glucose strips (blood glucose monitoring system; Accu-Check, Roche Diagnostics, Tokyo, Japan).
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