Figure 5.
ERTR7 immunolocalization (red) in heart sections shows that the mononuclear cell infiltrate (nuclei stained blue) in damaged regions of het-untreated cardiac muscle is mostly composed of fibroblasts. The less frequent areas of damage in the het-treated-8 group still contain fibroblasts, suggesting that the drug treatment is not acting directly on fibroblast proliferation or migration. Since very few areas of cardiac damage are present in het-treated-4 hearts, clusters of activiated fibroblasts are not typically present.