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. 2023 May 3;8:177. doi: 10.1038/s41392-023-01427-2

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Fig. 9 — Structural features of class F GPCR. Smoothened homolog SMO (PDB 5L7D) with large extracellular and cysteine-rich (CRD) domain. Solvent-accessible surface. Hydrophobic surface (red); hydrophilic surface (white)