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Effects of external spermine (a) or putrescine (b) on the 57 pS channel activity recorded in outside-out patches. Both PAs were applied at 3 mM at the holding potential of −50 mV. Solid and open columns show all-point amplitude histograms in control and after PA application, respectively. Representative current traces recorded in control (1) and in the presence of respective PA (2) are shown in the insets.
