This month's Genome Watch explores how genetic variation in restriction–modification systems from Streptococcus pneumoniae contributes to the defence against phages and to bacterial virulence.
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R.A.G. received her Ph.D. stipend from Pfizer, received funding to attend conferences from Pfizer and co-supervises a Ph.D. student funded by Pfizer. J.L. declares no competing interests.
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Lees, J., Gladstone, R. R–M systems go on the offensive. Nat Rev Microbiol 13, 131 (2015). https://doi.org/10.1038/nrmicro3435
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DOI: https://doi.org/10.1038/nrmicro3435
