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Impact of phrenicotomy on the volume of spontaneous ABs. Data presented here were collected during a hypercapnic respiratory challenge. Two-way ANOVA was not possible with the poikilocapnic baseline data since ABs were not observed in control uninjured rats at baseline. Only the uninjured animals showed a reduction in AB volume following phrenicotomy. ***P < 0.001, **P < 0.01, *P < 0.05, compared with uninjured.
