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Fig. 3. The effects of chronic hypercapnia (CHC) and olfactory denervation (OD) on
(A,B) integrated area of the fictive breaths (Vxs), (C,D) the total
fictive ventilation index (Vxs min-1) and (E,F) fictive
breath duration (s) recorded from in vitro brainstem-spinal cord
preparations taken from control (A,C,E) and CHC (B,D,F) toads. The data are
plotted as the mean ± 1 s.e.m. Symbols and abbreviations are the same
as those in Fig. 2.