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Forearm blood flow during intra-arterial coinfusion of insulin at 6 pmol min−1 (•) or placebo (
) with cumulative doses of C-peptide (2, 4, 8, 15, 30, 60 pmol min−1, infusion period 10 min each). Data are expressed as percentage change from baseline as means ± SEM, n = 8.
