5UBQ:
reference: Subnanometre-resolution structure of the doublet microtubule reveals new classes of microtubule-associated proteins., Ichikawa M, Liu D, Kastritis PL, Basu K, Hsu TC, Yang S, Bui KH, Nat Commun. 2017 May 2;8:15035. doi: 10.1038/ncomms15035. PMID: 28462916

This OCA Structure page
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