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Domain structure of the five MdCHK receptors. MdCHK receptors display a classical CHK organization with a CHASE sensing domain, transmembrane domains (TM), a histidine kinase (HK) domain composed of a HK dimerization and phosphoacceptor domain (HisKA) and a HK catalytic domain (HATPase), a receiver (REC)-like domain and a REC domain. The conserved residues of each domain are indicated (arrows).
