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Phylogenetic tree for members of the CDK protein family. The tree was constructed using the CLUSTAL software program (Higgins et al., 1992), with sequences selected from the databases. Rice CDKs are boxed. Amcdc2a-d, CDKs of snapdragon; Cdc2aAt and Cdc2bAt, CDKs of Arabidopsis; Cdc2MsA-F, CDKs of alfalfa; NtCdc2, CDK of tobacco; ZmCdc2, CDK of maize; ScCdc28, Cdc28 of S. cerevisiae; SpCdc2, Cdc2 of S. pombe; Cdk2–7, human CDKs.
