PECAM1 and capillary hemangioma: This was extended to other genes such as CD31, NOTCH1, PLXND1 and VEGFR1 (Table 1 and Figure 3—source data 1), each of which are expressed in infantile hemangioma endothelium in vivo (Boscolo et al., 2011; Nakayama et al., 2015; Wu et al., 2010), further confirming the successful differentiation of HemSCs into HemECs (Figure 3D and Figure 3—figure supplement 2A).