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Mean GH concentrations monitored every 10 min over 2.5 h during and after iv infusion of GHRH/GHRP-2 (top), L-arginine/GHRP-2 (middle), and L-arginine/GHRH (bottom). Bolus peptide injections were given at 30 min. Data are the mean ± sem (n = 12 eugonadal and n = 10 hypogonadal men).
