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Log concentration–response relaxation curves to adenosine (a) or 5′-N-ethylcarboxamido adenosine (NECA) (b), in the absence (open circle) and presence (closed circle) of dipyridamole (10 μM), on 1 μM noradrenaline (NA)-precontracted pig prostatic small arteries. Results are expressed as a percentage of the NA-induced contraction and represent mean ± s.e.m. of six arteries. *P < 0.05 versus control value (paired t test)
