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John M. McDowell, Murali Dhandaydham, Terri A. Long, Mark G. M. Aarts, Stephen Goff, Eric B. Holub, Jeffery L. Dangl, Intragenic Recombination and Diversifying Selection Contribute to the Evolution of Downy Mildew Resistance at the RPP8 Locus of Arabidopsis, The Plant Cell, Vol. 10, No. 11 (Nov., 1998), pp. 1861-1874
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McDowell et al. (1998) studied this question.
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