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Reversibility of NGOD probe with the alternate addition of (a) Hg2+ and l-Cys, (b) Hg2+ and l-AA, (c) l-Cys and Hg2+, (d) l-AA and Hg2+ (the concentration of Hg2+, l-Cys, and l-AA was maintained at 250 μM), and (e) feedback loops with write–read–erase–read function, (f) sequential logic circuit of the memory unit, and (g) truth table of the memory unit. In Figures (a)–(d), X-axis represents sequence of addition.
