Nature Reviews Microbiology 11, 667–673 (2013)

In Figure 1 of the above article, the amino acid sequences for PSMα4 in part b and PSM-mec in part c were transposed, and the amino acid sequences of δ-toxin and PSMβ2 in part b contained minor errors. The figure has now been corrected online and the authors apologize to readers for any confusion caused.