Model B, Case 2: Temporal behaviour of the PER protein with miRNA regulation. Degradation rate of the miRNA is fixed in all the cases and is taken to be c2 = 0.029. (a) Regulation with c1 = 10 h-1, c3 = 1 h-1 and c4 = 0.5 h-1. (b) regulation with c1 = 15 h-1, c3 = 3 h-1 and c4 = 1 h-1. (c) comparison of PER protein behaviour in (a) and (b). In all the cases, the volume of the system is taken to be 100.