Sample Sections of Mouse Heart (IMAGE) Boston Children's Hospital Caption In these sample sections of mouse heart, the color blue signifies scar tissue. Damage from scarring was minimized by early administration of the drug neuregulin. Read more about this on our Boston Children's Science and Clinical Innovation Blog, Vector. Credit Boston Children's Hospital 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.