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Distribution of magnetosome numbers in cells grown under various extracellular concentrations of Zn2+ in the presence of 20 μM Fe3+-quinate. The average numbers in the samples were 18.6, 12.1, and 6.4 per cell with respect to 1 μM (A), 20 μM (B), and 75 μM (C) ZnSO4, respectively. Values were obtained by counting of electron-dense particles in micrographs from a total of about 100 cells in each sample.
