Expression of pluripotent, gastrulation, and cardiac markers was detected by RT-PCR.37 (link),38 (link) Mouse Gapdh (4352932E; Applied Biosystems) was used as control. Analyzed genes included Sox2 (Mm00488369_s1), Oct4 (Mm00658129_gH), Fgf4 (Mm00438917_m1), Gsc (Mm00650681_g1), Sox17 (Mm00488363_m1), Mesp2 (Mm00655937_m1), Tbx5 (Mm00803521_m1), Nkx2.5 (Mm00657783_m1) and Mef2c (Mm01340839_m1; Applied Biosystems).