3U8N:
reference: Intersubunit bridge formation governs agonist efficacy at nicotinic acetylcholine alpha4beta2 receptors: unique role of halogen bonding revealed., Rohde LA, Ahring PK, Jensen ML, Nielsen EO, Peters D, Helgstrand C, Krintel C, Harpsoe K, Gajhede M, Kastrup JS, Balle T, J Biol Chem. 2012 Feb 3;287(6):4248-59. Epub 2011 Dec 13. PMID: 22170047

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