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Phylogenetic tree analysis of cyclins retrieved in Medicago truncatula, soybean, common bean and Arabidopsis. The complete protein sequences for 261 cyclins were aligned by ClustalW, and the phylogenetic tree was constructed using MEGA 7.0 by the neighbor-joining method with 1000 bootstrap replicates. All cyclins were classified into 10 distinct groups based on the nomenclature of Arabidopsis cyclins (from A to D, H, L, T, U, SDS and J18) and were distinguished by different colors.
