RNA Polymerase II (IMAGE) Hong Kong University of Science and Technology Caption RNA Polymerase II undergoes the intrinsic cleavage of the mis-incorporated nucleotide (the yellow part in the picture) during proofreading of the RNA transcription. Credit The Hong Kong University of Science and Technology 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.