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(a,b) The keyhole-shaped openings of AaLS-neg (a) and AaLS-13 (b). Each slot is surrounded by 16 protomers, 4 of which (shown in blue) lack the inter-pentamer interactions. (c,d) Scheme illustrating spontaneous encapsulation of supercharged GFP molecules by AaLS-13. A half-sliced AaLS-13 cage is depicted (d) to show association of the guest with the cage interior.
