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Comparison of Ca2+ and Ox2− aggregate in relation to Mg2+concentration. In B–D, only Ca2+ and Ox2− ions are displayed to clearly expose the difference among systems 4–6, while A also displays PO43− ions (transparent) for system 4.18 System 6, which is the highest in Mg2+ concentration among the three systems shown here, yields the smallest calcium phosphate/calcium oxalate aggregates. Although not shown in D, Mg2+ ions are located near Ox2− ions instead of directly binding to them.
