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Steve L. O'Kane, Jr., Ihsan A. Al-Shehbaz, Phylogenetic Position and Generic Limits of Arabidopsis (Brassicaceae) Based on Sequences of Nuclear Ribosomal DNA, Annals of the Missouri Botanical Garden, Vol. 90, No. 4 (Autumn, 2003), pp. 603-612
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O’Kane et al. (2003) studied this question.
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