$\text{s}$	Starvation signal
$I1$	IRT1 transcription rate
$I2$	IRT2 transcription rate
$I_{\text{t}}$	Ime1 transcription rate
${\text{I}}_{\text{m}}$	Ime1 mRNA concentration
${\text{I}}_{\text{p}}$	Ime1 protein concentration