Performance of the entropy-driven deoxyribozyme circuit. Sample numbers (as indicated in the text) are listed next to the bars. Color coding is as in Figure 2D. The pictures of the microtiter-plate wells containing different samples are shown in the blue box. The absorbance readings (at 414 nm) shown in the bar graph were taken 10 min after the H2O2 and ABTS were added to the DNA/hemin mixture and the pictures were taken 15 min after the H2O2 and ABTS were added to the DNA/hemin mixture. The inset shows the point mutation in the mutant Trigger. The toehold sequence is highlighted in bold. Whenever present, the final concentrations of Reporter, Gate, Fuel, Invader, and DNAzyme in these experiments were 200 nM, 200 nM, 500 nM, 200 nM, and 200 nM, respectively. The concentrations of Trigger and mutant Trigger in different reactions were as indicated.