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A) Ribbon structure of the AphB tetramer. Extended subunits are shown in cyan and magenta and compact subunits are shown in green and yellow (PDB ID: 3SZP). B) Monomer of the regulatory domain of AphB. The previously identified putative effector-binding pocket (denoted with an asterisk) is located between RD-I (cyan) and RD-II (magenta).16
