Correction: In the article “XenopusEmbryonic Spinal Neurons Express Potassium Channel Kvβ Subunits,” by M. A. Lazaroff, A. D. Hofmann, and A. B. Ribera, which appeared on pages 10706–10715 of the December 15, 1999 issue, in Table 2,Gmax (μsec) should readGmax (μS).