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The dual role of the PAR, the exposure of PB1 and the concertina movement at the NC-interface. (A) When the interface is open, the PAR interacts with PB1 (left) but when closed with PB2 (right). (B) The closure of the interface results in exposing α0 and its associated PB1, releasing it from its buried (inactive) state in the NC-interface and enabling it for membrane association.
