Figure 3. Stem cells are induced to differentiate into cardiomyocytes. (A) Human embryonic stem cells (hESC) expressing Oct4, Sox2, Nanog and SSEA. (B) hESC-derived cardiomyocytes (hESC-CMs) expressing MLC-2v, α-actinin, cardiac troponin-I (cTnI) and cardiac troponin-T (cTnT). Scale bars=25μm.