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Characterization of biogenic polyphosphate nanoparticles (BPNPs) within the algae cells: (a) appearance of the Synechococcus 7002 culture, (b) typical transmission electron microscopic (TEM) image of thin sections of Synechococcus 7002 cells, (c) energy dispersive spectroscopy (EDS) analysis of the yellow circle region in panel b, and (d) fluorescence microscope image of Synechococcus 7002 cells stained with 4′,6-diamidino-2-phenylindole (DAPI, ×400).
