Hydrogen-bonded self-organization may also play a role in the formation of observed self-organizing structures during the course of the FR. The tendency of FR-derived structures to form cell-sized structures (Figure ) is often noted, this is likely a scale under which various molecular forces act in concert to drive self-assembly . This adds novel commentary to the discussion of the presence of cell-sized organic structures which have been observed in carbonaceous meteorites for 60 years (e.g., ), and sometimes interpreted as biogenic (e.g., ). The bottom image series show that aggregates are common and not necessarily mutually attractive as they are often dispersed, and that furthermore the structures are not salt crystals since the images show the soluble fraction. They have similar size and morphology as the structures shown in the top row indicating the same structures are stable to the vacuum drying required for SEM imaging. In the rightmost top row, spherical structures were shown using Energy-Dispersive X-ray Spectroscopy (EDAX) to be C-rich, indicating they are carbonaceous, while the angular products were shown to be NaCl crystals (see Figures and).