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Flow-mediated vasodilatation (FMD) responses to l-NMMA in healthy control, DM-N and DM-H patients during clamped euglycemia (means ± SD). *P < 0.05 for between-group baseline differences for DM-H subjects vs. DM-N and healthy controls; †P < 0.05 vs. within-group baseline value in healthy control and DM-N patients; ‡P < 0.05 for between-group change in response to l-NMMA vs. DM-N patients; §P < 0.05 for between-group change in response to l-NMMA vs. healthy control subjects.
