The obstacle race of transcription (IMAGE) University of Würzburg Caption You can imagine transcription as an obstacle race in which the RNA polymerase has to overcome a number of hurdles. It is particularly difficult for it if the "rider" - the protein SPT6 - is missing. Credit Sandy Westermann 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.