6RJH:
reference: Multifunctional graphene supports for electron cryomicroscopy., Naydenova K, Peet MJ, Russo CJ, Proc Natl Acad Sci U S A. 2019 May 24. pii: 1904766116. doi:, 10.1073/pnas.1904766116. PMID: 31127045

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