Genetics. In the article “Characterization of the Saccharomyces cerevisiae ERG26 gene encoding the C-3 sterol dehydrogenase (C-4 decarboxylase) involved in sterol biosynthesis” by D. Gachotte, R. Barbuch, J. Gaylor, E. Nickel, and M. Bard, which appeared in number 23, November 10, 1998 of Proc. Natl. Acad. Sci. USA (95, 13794–13799), the authors request that the following correction be noted. The ERG26 gene product encoding the C-3 sterol dehydrogenase (C-4 decarboxylase) was incorrectly reported to contain 329 amino acids. The correct number is 349 amino acids. In the manuscript, Fig. 3 contains both the correct nucleic acid and polypeptide sequences, but the amino acid sequence is numbered incorrectly.