Figure 4.
Simplification of expressions of Kirchhoff polynomials in the coarse-grained representation. (a) Simple receptor trafficking model G and (b) simplification of its steady-state expression. Prime components with equal Kirchhoff polynomials have the same colour; reaction constant r2 is a label on a nuisance edge marked in black and does not partake in any prime component. Note that vertex labels are not important since they can change during edge contractions. Also, the symbol κ is omitted in front of the graphs for clarity.