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Charles M. Papa, Nathan M. Springer, Michael G. Muszynski, Robert Meeley, Shawn M. Kaeppler, Maize Chromomethylase Zea methyltransferase2 Is Required for CpNpG Methylation, The Plant Cell, Vol. 13, No. 8 (Aug., 2001), pp. 1919-1928
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Papa et al. (2001) studied this question.
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