We hypothesized that inhibiting "active" division triggers causes the time delay of the linker cleavage, resulting in timing control over DNA droplet division. Figure shows the design of a time-delay circuit comprising reactions (i) and (ii). (i) Active division triggers changed to inhibited division triggers by the hybridization of excess singlestranded RNAs (ssRNAs), named inhibitor RNAs. (ii) An RNase H degrades the inhibitor RNAs in the inhibited division triggers, thereby releasing active division triggers. These two reactions cause a time delay in the cleavage of the DNA linker.