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Witty M, Wallace-Cook AD, Albrecht H, Spano AJ, Michel H, Shabanowitz J, Hunt DF, Timko MP, Smith AG.Witty M, et al. Among authors: timko mp.Plant Physiol. 1993 Sep;103(1):139-47. doi: 10.1104/pp.103.1.139.Plant Physiol. 1993.PMID: 7516080Free PMC article.