Figure 6From: Robustness from flexibility in the fungal circadian clockThe model predicts that the positive loop promotes systematic entrainment in long days. A. The effect of varying the coupling strength of the positive feedback loop on conidiation phase ϕ FRQ . B. Conidiation phase dusk sensitivities ∂ϕ FRQ /∂t DUSK computed for short and long days (upper and lower plots respectively). In short days, ∂ϕ FRQ /∂t DUSK remains close to 0.5 as coupling strength is decreased, indicating systematic entrainment. In long days, however, ∂ϕ FRQ /∂t DUSK increases from 0.5 to 1 as positive feedback is abolished, quantifying the transition from an entrained to a (dusk-) driven rhythm that can be seen in A. This transition can be see in greater detail in Additional file 1, Figure S2B which shows the dependence of the sensitivity-photoperiod profile on positive feedback strength.Back to article page