Crystal Structure (IMAGE) Rutgers University Caption A crystal structure of a gene-specific transcription activation complex reveals the interactions between RNA polymerase (black, gray, and green), sigma (yellow), and DNA (red and pink; sequence elements in violet and blue) that mediate DNA binding and DNA unwinding in transcription initiation and reveals the interactions between the transcription activator protein (TAP; light blue), RNA polymerase, and sigma that mediate transcription activation. Credit Yu Feng and Richard H. Ebright Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.