| Network of M/M/∞ queues | Open conversion network |
|---|---|
| Station | Species |
| Customer | Molecule |
| Number of customers in station | Number of molecules of species |
| Arrival of a customer from outside the system | Production of a molecule from source |
| Departure out of system | Degradation |
| Transition from ith to jth station | Conversion from ith species to jth species |
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