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Evolutionary tree of the 31 subfamilies currently reported in Repbase Update. (Large nodes) Subfamilies with more than 10,000 elements; (medium nodes) 1000 to 10,000 elements; (small nodes) less than 1000 elements. Each of the 6 Repbase Update subfamilies listed in Figure 2 is labeled. The AluJ, AluS, and AluY classes of subfamilies are contained in boxes.
