And so when the RNA polymerase binds onto the promoter side, it knows it has to begin the process of transcription. Now, even though both bacterial cells, which are prokaryotic cells and human cells which are eukaryotic cells contain these promotocides, they are slightly different. So let's begin by discussing the promotosides we would normally find in a prokaryotic cell such as a bacterial cell. So we have two sequences that act as promoters. One of these sequences is found ten units, ten nucleotides to the left of that initial start of that transcription process. So to the left of that bacterial gene that we want to transcribe.