Immunohistochemistry staining in the heart for all groups.

Cells were stained with ED1 (macrophage marker), NG2 (pericyte marker), and GS1 (vascular cell marker) and compared to total number (TN) of cells in images (assessed via DAPI). No significant differences in ED1, NG2 or GS1 were found between groups. O+SVF heart images were stained with anti-GFP, and co-stained with either ED1, NG2, and GS1. Most of the GFP+ cells found in the heart four weeks after injection were also positive for NG2 or GS1 rather than ED1. YC n = 4, OC n = 3, O+EC n = 3, O+SVF n = 7.