<p><i>Cis</i>-acting elements are indicated by light blue boxes along the locus, with their position with respect to the site of transcription initiation underneath. The different types of activities of the elements are represented by arrows originating from the element: enhancer activities involved in the initiation of <i>krox20</i> expression are indicated by green arrows pointing toward the promoter, enhancer activities corresponding to direct autoregulation are indicated by blue arrows pointing back to the element and the potentiator activity of element C is represented by red arrows pointing toward element A. Question marks indicate that the activity is suspected, but not confirmed.</p
