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. 2016 Apr 14;7:11228. doi: 10.1038/ncomms11228

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(a) HAADF-STEM image of a thin-sectioned cell showing the nucleus (N), the chloroplast (Chl), the coccolith vesicle (CV)–reticular body system (RB) (encircled by the white line), coccolith calcite (blue arrowhead) and the Ca-rich body (red arrow). Additional organelles that are visible in the HAADF-STEM images are shown in Supplementary Fig. 4. (b) High-resolution images and corresponding Fourier-transformed image of coccolith calcite and the Ca-rich body. (c) STEM-EELS spectra measured at the carbon K-edge on the Ca-rich body, coccolith calcite and embedding resin. (d) STEM-EDX spectra of the Ca-rich body and coccolith calcite.