Cell Biology. In the article “The α chain of laminin-1 is independently secreted and drives secretion of its β- and γ-chain partners” by Peter D. Yurchenco, Yong Quan, Holly Colognato, Todd Mathus, David Harrison, Yoshihiko Yamada, and Julian J. O’Rear, which appeared in number 19, September 16, 1997, of Proc. Natl. Acad. Sci. USA (94, 10189–10194), the following corrections should be noted. (i) In Fig. 2 a and c, on the left side of the immunoblots, migration position “α/γ” should read “β/γ.” (ii) In Fig. 2a, eighth lane, the lower label (medium fraction, anti-E8-βγ) should read “α → β*” (i.e., transient transfection of a β stable clone with α cDNA).