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www. google.com

•          www.yahoo.com

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•          www.askjeeves. com

•          www.altavista

•          www.abc.chemistry. bsu.by/current/ fulltext. htm

•          www3.interscience. wiley.com

•          www.plants.ox. ac.uk

•          Scholar.google. com

•          http://patft. uspto.gov/ netahtml/ search-bool. html

•          www.sciencedirect. com/preprintarch ive

•          http://www.jstage. jst.go.jp/ browse/_journall ist#A

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•          People.ku.edu

•          www.che.ncsu. edu

•          Pubs.acs.org

•          Acta.chem-soc. si

•          www.ijpr-online. com

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•          www.clinchem. org

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•          www.plantphysiol. org

•          Jn.nutrition. org

•          www.plantcell. org

•          www.earlham. edu