Now the promoter region usually does not vary too much from one organism to another organism. In fact, the most common type of sequence that appears in our promoter region is known as the consensus sequence. And we'll talk much more about the consensus sequence and this promoter region when we'll get into the field of biochemistry. So let's discuss what we just said by looking at the following diagram. So basically this is our double stranded DNA. So this is the three end.