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Mean discharge properties of Early-I and Late-I PhrMNs. The discharge onset time (%TI; A), frequency (Hz; B), overall duration (ms; C), and total number of spikes per neural breath (D) were quantified before, during, and after hypoxia. *P < 0.05 and **P < 0.01 vs. baseline. #P < 0.05 and ##P < 0.01, significant difference between Early-I and Late-I PhrMNs.
