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In page Polychlorinated dibenzodioxins:

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The persistence of a particular dioxin congener in an animal is thought to be a consequence of its structure. Dioxins with no lateral (2, 3, 7, and 8) chlorines, which thus contain hydrogen atoms on adjacent pairs of carbons, can more readily be oxidized by cytochromes P450.[2] The oxidized dioxins can then be more readily excreted rather than stored for a long time.[citation needed]