A search for differences in the charge-to-mass ratio of protons and antiprotons, conducted at unprecedented levels of precision, results in stringent limits to the validity of fundamental physical symmetries. See Letter p.196
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Jungmann, K. Matter and antimatter scrutinized. Nature 524, 168–169 (2015). https://doi.org/10.1038/524168a
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DOI: https://doi.org/10.1038/524168a