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Neighbor-joining tree of RB and RBR proteins. Bootstrap values of 50% or higher are shown for each clade. At, Arabidopsis; Cr, Chlamydomonas reinhardtii; Dm, Drosophila melanogaster; Hs, Homo sapiens; Mm, Mus musculus; Nt, Nicotiana tabacum; Pt, Populus tremula × Populus tremuloides; Zm, Zea mays. See Supplemental Table II for GenBank accession numbers.
