In the article by Tang and Tang, entitled, “The 30-kD Domain of Protein 4.1 Mediates Its Binding to the Carboxyl Terminus of plC1n, a Protein Involved in Cellular Volume Regulation,” which appeared in the August 15, 1998 issue (Vol 92, No 4, pp 1442-1447), a correction should be noted. On page 1445, column 2, line 12, the text should read: “Musch et al38 proposed a possible model to explain how plC1n works.”