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(a) Representative secondary structure of the Hex carrier comprising a Hex coiled coil core (PDB ID: 3R47) and six SPAB domains flanking the core (PDB ID: 1BDC) connected by glycine-serine linkers. (b) Structure of SPAB–Hex–SPAB protein, which contains 12 SPAB domains. (c) Structure of Hex–SPAB protein with six SPAB domains on one side of the Hex coiled coil. Images are not drawn to scale.
