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1 On the methodological limitations of detecting oxidative stress: effects of paraquat on 1 measures of oxidative status in greenfinches 2 3 Richard Meitern, Elin Sild, Kalle Kilk, Rando Porosk, Peeter Hõrak* 4 5 Department of Zoology, Institute of Ecology and Earth Sciences, Tartu University, Vanemuise 46, 6 51014 Tartu, Estonia, Centre of Excellence FIBIR 7 8 2 Molecular Ecology & Evolution Lab, Department of Biology, Lund University, 9 Ecology Building, Sölvegatan 37, SE-223 62 Lund, Sweden 10 11 Department of Biochemistry, Medical Faculty; Tartu University, Ravila 19, 50411 Tartu, Estonia, 12 Centre of Excellence for Translational Medicine 13 14 *Author for correspondence ([email protected]) 15 16 http://jeb.biologists.org/lookup/doi/10.1242/jeb.087528 Access the most recent version at J Exp Biol Advance Online Articles. First posted online on 11 April 2013 as doi:10.1242/jeb.087528