The model contains one compartment called C. There are four species called S1, S2, S3 and S4 and one parameter called k2. The model contains three reactions defined as:
Reaction | Rate |
S1 → S2 | k2 · S1 · C · time |
S2 → S3 | k2 · S2 · C · time |
S3 → S4 | k2 · S3 · C · time |
where the symbol 'time' denotes the current simulation time.
Both reactions S1 → S2 and S3 → S4 define a local parameters k2 which has a scope local to the defining reaction and are different from each other and the global parameter k2 used in the reaction S2 → S3.
The initial conditions are as follows:
Value | Units | |
Initial amount of S1 | 1.0 × 10−4 | mole |
Initial amount of S2 | 0 | mole |
Initial amount of S3 | 0 | mole |
Initial amount of S4 | 0 | mole |
Value of parameter k2 | 0.5 | second-2 |
Value of local parameter k2 (R1) | 0.7 | second-2 |
Value of local parameter k2 (R3) | 1 | second-2 |
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.