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Overall architecture of SubAB. The A1 component of the A-subunit (SubA) is shown in light blue, whereas the α-helix A2 is shown in blue. The disulfide tethering the A1 and A2 is shown in red. Each protomer of the pentameric B-subunit (SubB) is colored in cyan, yellow, lemon, salmon, and pale green. The figure was generated using PyMOL (29).
