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(A) Orthologues of genes encoding the key enzymes for the biosynthesis and metabolism of cytokinin. (B) Orthologues of genes encoding the components in the signal transduction pathways of cytokinin. Gene IDs were marked on the left. +, up-regulated; -, down-regulated; T, up- and down-regulated compared to the previous growth stage; C, E-type compared with Z-type.
