The model contains one compartment called C. There are four species called S1, S2, S3 and S4. The model contains two reactions defined as:
Reaction | Rate |
S1 + S2 → S3 + S4 | k · S1 · S2 · C |
S3 + S4 → S1 + S2 | k · S3 · S4 · C |
Reaction S1 + S2 → S3 + S4 defines one local parameter k. Reaction S3 + S4 → S1 + S2 defines another (different) local parameter k. Note that these parmeters have a scope local to the defining reaction.
The model contains two events that assign values to species S1 and S4:
Trigger | Delay | Assignments | |
Event1 | S4 > S2 | − | S1 → 2 × 10−3 | Event2 | S3 > 2.25 × 10−3 | − | S4 → 1 × 10−3 |
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1.0 × 10−3 | mole |
Initial amount of S2 | 1.0 × 10−3 | mole |
Initial amount of S3 | 2.0 × 10−3 | mole |
Initial amount of S4 | 1.0 × 10−3 | mole |
Value of local parameter k | 0.75 × 103 | litre mole-1 second-1 |
Value of local parameter k | 0.25 × 103 | litre mole-1 second-1 |
Volume of compartment C | 1 | litre |
The species values are given as amounts of substance to make it easier to use the model in a discrete stochastic simulator, but (as per usual SBML principles) their symbols represent their values in concentration units where they appear in expressions.