6CVM:
reference: Atomic Resolution Cryo-EM Structure of beta-Galactosidase., Bartesaghi A, Aguerrebere C, Falconieri V, Banerjee S, Earl LA, Zhu X, Grigorieff N, Milne JLS, Sapiro G, Wu X, Subramaniam S, Structure. 2018 May 10. pii: S0969-2126(18)30129-1. doi:, 10.1016/j.str.2018.04.004. PMID: 29754826

This OCA Structure page
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