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Determinations of early and late activating components quantified by taking the relevant areas under the graph. Frequency distributions for the final level of stratification: young male WT (a), young female WT (b), old male WT (c), old female WT (d), young male Scn5a+/− (e), young female Scn5a+/− (f), old male Scn5a+/− (g) and old female Scn5a+/− (h).
