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Effect of BP or end-expiratory CO2 on the firing rate of presympathetic and RTN neurons. A: discharge rate (spikes/s; scatterplot) of 28 presympathetic and 7 RTN neurons recorded at high and low BP (mean ± SE indicated below graph). B: discharge rate of 14 presympathetic and 29 RTN neurons at high (>5.5%) and low (<5.5%) eeCO2. Statistical significance: ***P < 0.0003, ****P < 0.0001. See text for further details regarding statistics.
