FROM THE ACADEMY. For the article “Biological clocks” by Norio Ishida, Maki Kaneko, and Ravi Allada, which appeared in number 16, August 3, 1999, of Proc. Natl. Acad. Sci. USA (96, 8819–8820), the authors note that (i) the first name of Dr. Honjo that appeared in the acknowledgments is misspelled and should be Tasuku and (ii) the name of the last author in ref. 5 also is misspelled and should be Tanimura.