Adult OPCs Histone Tags (IMAGE) Advanced Science Research Center, GC/CUNY Caption The stem-like cells called oligodendrocyte progenitors (red) in the adult brain are characterized by abundant histone H4 acetylation tags (green text) that regulate their proliferation and affect the size of the progenitor pool available for myelin repair. When acetylation is blocked (red text), fewer cells are available in the adult brain for myelin repair. Credit David Dansu, Ipek Selcen, Patrizia Casaccia Usage Restrictions All rights reserved License Original 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.