Antibody:	anti-Endomucin (V.5C7; sc-53941)
Detection system:	Secondary antibody coupled to horseradish peroxidase
Assay notes:	The authors developed three monoclonal antibodies but did not specify which was used to generate the data in Figs 3 and 5; it is possible V.1A7 (MGI:5637518) or even V.7C7 (MGI:5637519) was used to generate those data.

Structure	Level	Pattern	Image	Note
TS10: embryo	Absent		3A

Structure	Level	Pattern	Image	Note
TS28: vasculature of uterus	Present		3A	Expression is present in the blood vessels of the utuerus.

Structure	Level	Pattern	Image	Note
TS12: blood vessel	Strong		3D	Expression is present in intersomitic vessels.

Structure	Level	Pattern	Image	Note
TS12: blood vessel	Present		3I , 3G , 3H
TS12: blood island	Absent		3G , 3H , 3I

Structure	Level	Pattern	Image	Note
TS28: vasculature of uterus	Present		3G	Expression is present in the blood vessels of the utuerus.

Structure	Level	Pattern	Image	Note
TS13: blood vessel	Present		3K	Expression is present in the endothelium of capillaries and large blood vessels throughout the embryo.

Structure	Level	Pattern	Image	Note
TS19: dorsal aorta	Strong	Clusters	4C , 4A , 4B	Expression is present on the endothelium of the aorta, as well as on cell clusters associated with the endothelium; they may be hmatopoietic progenitors.

Structure	Level	Pattern	Image	Note
TS23: blood vessel	Present		4L	Expression is present in venules.
TS23: blood	Present		4L	The stained cell could be either a circulating endothelial precursor or a hematopoietic progenitor.

Structure	Level	Pattern	Image	Note
TS23: renal vasculature	Present		5A
TS23: descending aorta	Present		5D , 5A	Focal expression is observed.
TS23: epithelium	Absent		5A

Structure	Level	Pattern	Image	Note
TS28: aorta	Present		5G	Focal expression is observed.