This is the readme.txt for the model associated with the paper:

Walther Akemann, Alicia Lundby, Hiroki Mutoh, Thomas Knopfel. Effect
of voltage sensitive fluorescent proteins on neuronal
excitability. Biophys. J. 2009; 96: 3959-3976

These model files were contributed by Walther Akemann and Thomas
Knopfel.

The files contain the descriptor files for active conductances in a
monocompartment Purkinje cell model. Ion channel gating currents
(igate) are calculated from the first derivative of the state
dynamics.

Two voltage-sensitive fluorescent proteins, VSFP2.3 and VSFP3.1, are
modeled with a 8-state reaction (refered to as Model III in the paper)
to represent the sensing and fluorescence dynamics of these proteins.

To reproduce the simulations shown in Fig. 9 (left panel).  Simply
auto-launch from ModelDB (after NEURON is installed) or download and
extract the archive (a new folder is created), then compile the mod
files (and start) under

Linux:
------
by executing "nrnivmodl" in the expanded folder.  Then type 
"nrngui mosinit.hoc".

mswin:
------
by running mknrndll (select the new folder).  Then in Windows Explorer
double click on the mosinit.hoc file

MAC OS X:
---------
by dragging and dropping the new folder onto the mknrndll icon.  Drag
and drop the mosinit.hoc file onto the nrngui icon.

Once the simulation has loaded:
-------------------------------
Press "Start".  The simulation takes a little under 30 seconds on a
2.8 GhZ Pentium 4.  The simulations from the left panel of figure 9
appears: