= E. Coli K-12 MG1655 promoter
{c}
https://biocyc.org/group?id=:ALL-PROMOTERS&orgid=ECOLI
From this we see that there is a convention of naming promoters as <protein> name + <P>[p], e.g. the first <gene> in <E. Coli K-12 MG1655 promoter thrLp> encodes protein `thrL`.
It is also possible to add numbers after the `p`, e.g. at https://biocyc.org/ECOLI/NEW-IMAGE?type=OPERON&object=PM0-45989 we see that the protein `zur` has two promoters:
* `zurp6`
* `zurp7`
TODO why 6 and 7? There don't appear to be 1, 2, etc.