3BBR:
reference: Structural proof of a dimeric positive modulator bridging two identical AMPA receptor-binding sites., Kaae BH, Harpsoe K, Kastrup JS, Sanz AC, Pickering DS, Metzler B, Clausen RP, Gajhede M, Sauerberg P, Liljefors T, Madsen U, Chem Biol. 2007 Nov;14(11):1294-303. PMID: 18022568

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