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Neighbor-joining phylogenetic tree of full-length SERK and SERK-like protein sequences generated using the Jones-Taylor-Thornton (JTT) model and gamma-distributed (gamma = 0.97) with 1,000 bootstrap replicates. Four branches, SERK1/2, SERK3/4/5, NIK and Other are marked with different colors. At: Arabidopsis thaliana; Cl: Cunninghamia lanceolata; Mt: Medicago truncatula; Os: Oryza sativa; Zm: Zea mays. Accession numbers are provided in Supplementary Table S2.
