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. 2011 Jul 14;119(11):1659–1664. doi: 10.1289/ehp.1003265

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Percent branched PFOS isomers [Σbranched/(Σbranched + linear)] in 20 matched samples of maternal serum at 15 weeks of gestation and cord serum at delivery. Samples are arranged, from left to right, by increasing branched PFOS isomer content of the maternal sample.