As mentioned in the Results section, it has not been revealed what ORN demonstrates oscillatory or dispersive behavior and what ORN reaches a steady state without demonstrating such behavior. The time courses of the concentrations of chemical substances (Figures and) in the present work indicate that an ORN with a simple structure such as that shown in Figure reaches a steady state. Essentially the same results are obtained for ORNs under various reaction conditions and those with structures that differ from that shown in Figure , indicating that the results in Figures and demonstrate the fundamental properties of an ORN with a simple structure. The same conclusion was also obtained by experiments (Figure ).