So the primal box contains a consensus sequence, a sequence that doesn't change when we go from one organism to another organism. And the sequence is Tat, where T is thymine and A is adenine. Now, we have another promoter that has found 35 nucleotides upstream to the left of that bacterial gene and this contains a consensus sequence of TTGACA. So we see that one of these promoter sites is found 35 nucleotides from the start of that transcription process. And the other one, called the primal box, is found ten nucleotides from the start. And so when that RNA polymerase is traveling along our double stranded DNA molecule in that bacterial cell it eventually travels very, very quickly until it locates these regions.