Biochemistry. In the article “Characterization of recombinant phytochrome from the cyanobacterium Synechocystis” by Tilman Lamparter, Franz Mittmann, Wolfgang Gärtner, Thomas Börner, Elmar Hartmann, and Jon Hughes, which appeared in number 22, October 28, 1997, of Proc. Natl. Acad. Sci. USA (94, 11792–11797), a name appeared incorrectly in the acknowledgments on page 11797 due to a printer’s error. Prof. Silvia Braslavski (Max-Planck-Institut für Strahlenchemie, Mülheim) should be listed as Prof. Silvia Braslavsky.