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Domain structure of cytokinin receptor (exemplified by CRE1/AHK4 from Arabidopsis). Protein domains: TM – transmembrane; LB – ligand-binding (CHASE); HK – histidine kinase; Ac – acceptor; Ck – cytokinins; H – conserved histidine; D – conserved aspartate; N and C denote the N- and C-termini of the protein. The rightwards arrows indicate the sites for phosphorylation and the transfer of high-energy phosphates (~P).
