The present invention provides a model that can be use to describe
biological processes having a complex spatial geometry, for example, cell
signaling processes. The models can also be used to model the pathology
underlying diseases characterized by disrupted signaling pathways, and to
identify target proteins at an appropriate site in a signal transduction
network such that modulation of the target proteins elicits therapeutic
effects. Methods of modeling diffusion processes, as well as
machine-readable products embodying the methods are also disclosed.