Files in this Data Supplement:

• Supplemental file 1 - Fig. S1 and S2 (Expression of adult globin [S1] and hematopoietic markers [S2] in cells from P-Sp explant culture), S3 (Endothelial cell-specific Loss-of-Notch signaling in Tie2-cre; Mib1^f/f embryos), S4 (Gata3 expression in the mesenchyme underneath the aorta in E9.5 Tie2-cre; Mib1^f/f embryos), S5 (Cre activation in the endothelium in Tie2-cre embryos), S6 (Localization of sympathetic ganglion and SAPs in the AGM), S7 and S8 (Notch signaling in the aortic floor [S7] and SAPs [S8]), S9 (Expression of Notch ligands in OP9 cells and P-Sp), and S10 (Generation of OP9-MSCV-Dll1 stromal cell lines).
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