Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| E. coli | Yeast (S. cerevisiae) | Human | Type | Substrates |
| --- | --- | --- | --- | --- |
| AlkA | Mag1 | MPG | monofunctional | 3-meA, hypoxanthine |
| UDG | Ung1 | UNG | monofunctional | uracil |
| Fpg | Ogg1 | hOGG1 | bifunctional | 8-oxoG, FapyG |
| Nth | Ntg1 | hNTH1 | bifunctional | Tg, hoU, hoC, urea, FapyG |
| Nth | Ntg2 | hNTH1 | bifunctional | Tg, hoU, hoC, urea, FapyG |
| Nei | Not present | hNEIL1 | bifunctional | Tg, hoU, hoC, urea, FapyG, FapyA |
| Nei | Not present | hNEIL2 | bifunctional | AP site, hoU |
| Nei | Not present | hNEIL3 | bifunctional | unknown |
| MutY | Not present | hMYH | monofunctional | A:8-oxoG |
| Not present | Not present | hSMUG1 | monofunctional | U, hoU, hmU, fU |
| Not present | Not present | TDG | monofunctional | T:G mispair |
| Not present | Not present | MBD4 | monofunctional | T:G mispair |
Question:
Which E. coli has a substrate of uracil?
Answer:
UDG