A. WiCell 19-9-11 iPSCs, which stained positive for Oct4, were cultured in E8 medium supplemented with 10 μM Y-27632 ROCK inhibitor for 48 hours. B. The iPSCs were then induced with 6 μM of CHIR99021 in LaSR Basal medium for 48 hours, at which point the cells were positive for Brachyury, a mesoderm marker. C. The cells were further cultured in LaSR Basal media until they expressed CD34, a marker for endothelial progenitors. D. Roughly 15–25% of the differentiated cells expressed CD34. All scale bars represent lengths of 200 μm.