Other categories referring to Cell-attached patches on the proximal 100um of the apical dendrite did not contain sAHP channels. Amputation of the apical dendrite approximately 30 micron from the soma, while simultaneously recording the sAHP whole cell current at the soma, depressed the sAHP amplitude by only approximately 30% compared with control. Somatic cell-attached and nucleated patches did not contain sAHP current. Amputation of the axon about 20um from the soma had little effect on the amplitude of the sAHP. By this process of elimination, it is suggested that sAHP channels may be concentrated in the basal dendrites of CA1 pyramids
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