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Figure 2 (A) Line graph represents the forearm spillover (FSO) of norepinephrine (NE) in response to intra-arterial (I/A) clonidine, in healthy volunteers (n = 15). (B) Line graph represents the FSO of NE in response to I/A clonidine, in patients with congestive heart failure (n = 10) (p = NS).