Corrections and clarifications.
The image in the Table of Contents for the issue of 23 October (p. 523) illustrating the report by G. D. Schellenberg et al. (p. 668) and the Research News article by Jean Marx (p. 550) about early-onset familial Alzheimer's disease being linked to chromosome 14 was incorrect. The correct figure appears on page 668 of the same issue.