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

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

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

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

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

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

screenshot should appear here