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Effect of different pre-incubation conditions on cAMP levels of carotid body (CB, n= 6–9), superior cervical ganglia (SCG, n= 2–5) and carotid artery (CA, n= 4–5) in response to hypoxia (5% O2/5% CO2) and in the presence of isobutylmethylxanthine (500 µM). Tissues were pre-incubated in (A) hyperoxia (95% O2/5% CO2) or (B) normoxia (20% O2/5% CO2). P > 0.05.
