Figure 6: SSEA-4-labeling on a representative cardiac progenitor cell. Confocal laser scanning microscope images (magnitude 630×) were taken after immunohistochemical staining of cardiac progenitor cells in the right atrium of fetal sheep using a FITC-labeled anti-SSEA-4 antibody: A) DAPI stained cell nuclei B) FITC labeled cell surface and cytoplasm identifies SSEA4 expression on these cells C) merged image of DAPI and FITC staining.