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Guo-Liang Wang, De-Ling Ruan, Wen-Yuan Song, Steve Sideris, LiLi Chen, Li-Ya Pi, Shiping Zhang, Zhen Zhang, Claude Fauquet, Brandon S. Gaut, Maureen C. Whalen, Pamela C. Ronald, Xa21D Encodes a Receptor-Like Molecule with a Leucine-Rich Repeat Domain That Determines Race-Specific Recognition and Is Subject to Adaptive Evolution, The Plant Cell, Vol. 10, No. 5 (May, 1998), pp. 765-779
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Wang et al. (1998) studied this question.
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