5A9V:
reference: Structure of BipA in GTP form bound to the ratcheted ribosome., Kumar V, Chen Y, Ero R, Ahmed T, Tan J, Li Z, Wong AS, Bhushan S, Gao YG, Proc Natl Acad Sci U S A. 2015 Aug 17. pii: 201513216. PMID: 26283392

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