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Glucagon‐like peptide (GLP)‐1 secretion during the meal tolerance test. Changes in (a) plasma glucose and (b) serum insulin and (c) plasma intact GLP‐1 levels during the meal tolerance test with (open symbols) or without (filled symbols) acarbose pretreatment. Insets show only early phase (0–15 min) responses of (a) plasma glucose and (b) serum insulin from meal tolerance tests without acarbose pretreatment. Data are the mean ± SE. *P < 0.05, **P < 0.0005.
