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The multinomial distribution of a promoter with one TF and its RNAP.
| State | TF | RNAP | Weight |
| 1 | 0 | 0 | 1 |
| 2 | 0 | 1 | qp |
| 3 | 1 | 0 | qTF |
| 4 | 1 | 1 | wTFpqpqTF |
The weights qp, qTF and wTFpqpqTF denote the ratios between the probabilities of States 2,3,4 respectively assuming the weight of promoter with no RNAP or TF is 1.
