RNA Polymerase II Elongation Factor ELL3 and RNA Polymerase II (image) Stowers Institute for Medical Research Share Print E-Mail Caption Both the RNA polymerase II elongation factor ELL3 and RNA polymerase II localize to the nucleus of the mature mouse sperm. This finding raises the possibility that transcription factors could prime future gene expression by marking enhancers in embryonic stem cells or even as early as in the germ cell state. Mouse sperm were fixed, cryo-sectioned, and double stained with ELL3 (6 nm gold particles) and Pol II (12 nm gold particles) antibodies. Credit Courtesy of Shilatifard Lab, Stowers Institute for Medical Research. Usage Restrictions None 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.