6XBK:
reference: Sterols in an intramolecular channel of Smoothened mediate Hedgehog signaling., Qi X, Friedberg L, De Bose-Boyd R, Long T, Li X, Nat Chem Biol. 2020 Sep 14. pii: 10.1038/s41589-020-0646-2. doi:, 10.1038/s41589-020-0646-2. PMID: 32929279

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