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• 15:17, 5 October 2016 Debra Tabron (talk | contribs) uploaded File:Deeb-Article 1-Figure 1.JPG (Figure 1. a) Structure of a perfluoroalkyl substance, PFOS, compared with b) the structure of a polyfluoroalkyl substance, 6:2 fluorotelomer sulfonate (6:2 FTSA).)