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Apoferritin and supramolecular hosts used for the crystal preparation. (a) Recombinant apoferritin from Pyrococcus furiosus (PDB id: 2JD6) with a diameter of ∼12 nm. (b) Synthesis of the charged resorcin[4]arene (R) hosts. (c) Synthesis of the cationic pillar[5]arene (P) hosts. (d) Schematic presentation of all the hosts used in this study. Diameters (dhost) of the cationic hosts are approximately 1.5–2 nm.
