Snakes and Ladders (image) University of New South Wales Share Print E-Mail Caption Workers representing the repair system known as nucleotide excision repair (NER), repairing DNA and snakes, representing proteins that bind DNA at gene promoters, potentially preventing them from doing this. Credit Jackie Mostek Usage Restrictions To be used only in relation to this research and credited. Share Print E-Mail 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.