Acting Older (image) Rockefeller University Share Print E-Mail Caption Five days after an injury to young mouse skin (blue), new skin cells (green) fill the wound (top). When researchers turned down expression of a protein skin cells use to talk to nearby immune cells, new skin took much longer to arrive (bottom). Credit Laboratory of Mammalian Cell Biology at The Rockefeller University/Cell Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.