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Electron cryomicrographs of frozen-hydrated wt_DROS (a), wt_BAC (b), Δ31_DROS (c), and Δ31_BAC (d) particles. Note the constant diameter of the particles and distinctive circular and hexagonal profiles. Δ31_DROS and Δ31_BAC particles show an absence of density in the center of the particles. Inset: particles from the same preparation negatively stained with uranyl acetate. Bar = 500 Å.
