nervous system
• enhanced due to slower A-current inactivation during repolarization
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• CA1 pyramidal neuron apical dendrites are hyperexcitable compared with wild-type neurons
• however, somatic membrane excitability and GABAergic currents are normal
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• neurons exhibit extended spike-timing window for long term potentiation compared with wild-type neurons
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• mice lack the distal dendritic A-type potassium current gradient compared with wild-type mice
• calcium electrogenesis is enhanced in CA1 dendrites compared to in wild-type cells
• remaining A-type potassium channels in dendrites are Kcna4 mediated
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