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Model variables and symbols
| O | Total operon concentration |
| OF | Free operon concentration |
| MF | Free mRNA concentration |
| E | Total enzyme concentration |
| EA | Active enzyme concentration |
| T | Tryptophan concentration |
| R | Total repressor concentration |
| RA | Active repressor concentration |
| P | mRNA polymerase concentration |
| ρ | Ribosomal concentration |
| D | mRNA destroying enzyme concentration |
