Using Matlab and Simbiology we modelled the stages of YF1 and like Wageningen 2016 iGEM team we modelled the YF1 light sensing protein as described by Möglich et al in the stages of Yll (light) Ydl/ld (transition) and Ydd (dark stage). We used the same mathematical formulas used in Wageningn 2016 iGEM team in describing the different stages of the light sensing protein however we set our parameter in terms of working from a rich light environment to no light. The model suggests that:

1. The light sensing protein is not strict; all three stages of the YF1 light sensing protein can exist at the same time if some light is introduced. In fact, the light-sensing protein readily converts Ydd and Ydl/ld into Ydd in the presence of any light.

2. Given long enough time in a dark environment (over the course of hours) Ydd expression will increase and all the other two stages will convert to Ydd.

3. A second level inhibitor is needed to account for the early possible exposure of light in the lab environment.

Figure 1 is the calculated model of and Figure 2 is how we designed our system in the Simbiology toolbox.