The model contains four variable parameters called p1, p2, p3 and p4 and two constant parameters called k1 and k2. The model contains four rules defined as:

Type Variable Formula
Algebraic n/a S4 − S1
Rate p1 −k1 · p1 · p2 + k2 · p3
Rate p2 −k1 · p1 · p2 + k2 · p3
Rate p3 k1 · p1 · p2 − k2 · p3

The initial conditions are as follows:

Value Units
Initial value of parameter p1 1.0 × 10−3 any
Initial value of parameter p2 2.0 × 10−3 same as p1
Initial value of parameter p3 1.0 × 10−3 same as p1
Initial value of parameter p4 1.0 × 10−3 same as p1
Value of parameter k1 0.75 (units of p1)-1 second-1
Value of parameter k2 0.25 second-1