5B2H:
reference: Conformational divergence in the HA-33/HA-17 trimer of serotype C and D botulinum toxin complex., Sagane Y, Hayashi S, Akiyama T, Matsumoto T, Hasegawa K, Yamano A, Suzuki T, Niwa K, Watanabe T, Yajima S, Biochem Biophys Res Commun. 2016 May 27. pii: S0006-291X(16)30821-X. doi:, 10.1016/j.bbrc.2016.05.113. PMID: 27237978

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