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Edited by Dr Flavie Strappazzon Supplementary information Rights and permissions Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made

The study looked at the genes of 25 participants that had been diagnosed as sensitive to mercury compared with a control group of 25