Liver Cell Nucleosome (IMAGE) University of Pennsylvania School of Medicine Caption Schematic of opening of nucleosome in liver cell, with linker histone ejected, accessible nucleosomes with pioneer factors, and liver-specific transcription factors. Credit Ken Zaret, Ph.D., Perelman School of Medicine, University of Pennsylvania 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.