Damage to Human Fibroblasts (IMAGE) NASA/Johnson Space Center Caption This is TYPE IV damage to human fibroblasts after bleomycin treatment, shown in a 53BP1 stain. Credit Bioanalytical Core Laboratory Usage Restrictions Bioanalytical Core Laboratory 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.