microbiology. For the article “Two major classes in the M protein family in group A streptococci,” by Paul O’Toole, Lars Stenberg, Marianne Rissler, and Gunnar Lindahl, which appeared in issue 18, September 15, 1992, of Proc. Natl. Acad. Sci. USA (89, 8661–8665), the author name Paul O’Toole should have appeared as Paul W. O’Toole. The online version has been corrected. The corrected author line appears below.
Paul W. O’Toole, Lars Stenberg, Marianne Rissler, and Gunnar Lindahl