BIOCHEMISTRY. For the article “Structural basis of nonnatural amino acid recognition by an engineered aminoacyl-tRNA synthetase for genetic code expansion,” by Takatsugu Kobayashi, Kensaku Sakamoto, Tetsuo Takimura, Ryo Sekine, Kelly Vincent, Kenji Kamata, Susumu Nishimura, and Shigeyuki Yokoyama, which appeared in issue 5, February 1, 2005, of Proc. Natl. Acad. Sci. USA (102, 1366–1371; first published January 25, 2005; 10.1073/pnas.0407039102), the author name Kelly Vincent should have appeared as Vincent P. Kelly. The corrected author line appears below. The online version has been corrected.

Takatsugu Kobayashi, Kensaku Sakamoto, Tetsuo Takimura, Ryo Sekine, Vincent P. Kelly, Kenji Kamata, Susumu Nishimura, and Shigeyuki Yokoyama