Resurgent Na⁺ currents promote ultrafast spiking in projection neurons that drive fine motor control.

Contrasting sharply with the marked age-dependent increases of males, we observed a small trend of increased Navβ4 expression after 20 dph (Fig. 9a, c ) and a modest, significant increase in the proportion of Navβ4-expressing cells between 20 dph and older ages (Fig. 9a , d).

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