Correction for Pollmann et al., A plant porphyria related to defects in plastid import of protochlorophyllide oxidoreductase A

BIOPHYSICS AND COMPUTATIONAL BIOLOGY Correction for “Site-directed spin labeling of a genetically encoded unnatural amino acid,” by Mark R. Fleissner, Eric M. Brustad, Tamás Kálai, Christian Altenbach, Duilio Cascio, Francis B. Peters, Kálmán Hideg, Peter G. Schultz, and Wayne L. Hubbell, which appeared in issue 51, December 22, 2009, of Proc Natl Acad Sci USA (106:21637–21642; first published December 7, 2009; 10.1073/pnas.0912009106). The authors request that Sebastian Peuker be added to the author list between Kálmán Hideg and Peter G. Schultz and be credited with designing research and performing research. The online version has been corrected. The corrected author and affiliation lines, author contributions, and related footnotes appear below.