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Figure 2 Forearm nitrite (upper panel) and cyclic guanosine monophosphate (cGMP) (lower panel) balance during intrabrachial acetlycholine infusion in placebo- and growth hormone (GH)-treated patients at baseline and at the end of treatment. *p < 0.05 versus the corresponding basal value; #0.1 > p > 0.05 versus the corresponding basal value. The signs (+) and (–) indicate uptake and release, respectively.