Literature Cited
Introduction Materials & Methods Results Discussion
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NCAT. 2004 Aug. [Cited 2008 Aug 27]. 28 p. Available from
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http://www.internationaltradergroup.com/images/green%20onion.jpg
http://www.infovisual.info/01/photo/romaine%20lettuce.html
http://4e.plantphys.net/article.php?ch=6&id=78