The delayed rectifiers gK,L and gDR as functions of age. A,B, Changes in incidence with age in cultures (A) and acute preparations (B). In this and subsequent figures, thenumber of cells from which recordings were obtained at each stage is given at the top of the columns.C, D, Maximal sizes of the conductances as functions of age. Zero values are not included. Values calculated as described in Materials and Methods and Results.