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Steffen JG, Kang IH, Macfarlane J, Drews GN.Steffen JG, et al. Among authors: drews gn.Plant J. 2007 Jul;51(2):281-92. doi: 10.1111/j.1365-313X.2007.03137.x. Epub 2007 Jun 8.Plant J. 2007.PMID: 17559508Free article.