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Structure of the β1a-subunit of the skeletal muscle dihydropyridine receptor in complex with the alpha-interacting domain (AID) peptide. The five principal domains of β1a are indicated: the N-terminal domain (NTD), Src homology 3 (SH3), the HOOK region, guanylate kinase (GK) and the C-terminal domain (CTD). Adapted from the PDB structure 4ZW2 (Norris et al. 2017)
