Before revision:  We use our analytical results to show how one can reduce the number of equations and parameters in ODE models of cell signalling cascades, and how delay differential equation models can sometimes be approximated through the use of simple expressions involving the incomplete gamma function.
After revision:  We use our analytical results to show how one can reduce the number of equations and parameters in ODE models of cell signalling cascades, and how delay differential equation models can be approximated with the use of simple expressions involving the incomplete gamma function.