Genetically Altered Skin Cells (IMAGE) University of Cincinnati Caption Dorothy Supp, PhD, has developed a modified skin cell that may help protect cultured skin substitutes from infection. Here, cells that were genetically modified to produce higher levels of a protein known as human beta defensin 4 are shown in green. Credit University of Cincinnati and Shriners Hospitals for Children Usage Restrictions Photo credit to University of Cincinnati and Shriners Hospitals for Children 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.