So a special protein complex that consists of twelve proteins known as RNA polymerase two bind onto the start side, the transcription start side, and this is where initiation actually takes place. This is where we begin the process of transcription. So this is our transcription start site. So this is our start site, this is exon number one, this is exxon number two and exxon number three, this is, let's say, intro number one, and this is intron number two. So we have introns exxon's a start site. Now, what about this segment and this segment here?