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Profile of the grids used for determination of membrane protein structures solved by using cryo-EM single-particle analysis below 3.0 Å resolution in the last two years (2021–2022) available in the Protein Data Bank. (A) Type of the grids employed; (B) types of the cooper metal mesh and carbon foil of Quantifoil® grids; (C) types of the gold metal mesh and carbon foil of Quantifoil® grids; (D) types of the gold metal mesh and gold foil of UltrAuFoil® grids.
