Probe:	Sox18 probe3
Probe preparation:	Antisense labelled with digoxigenin RNA
Visualized with:	Alkaline phosphatase

Structure	Level	Pattern	Image	Note
TS11: allantois	Present		1a
TS11: blood island	Present		1a

Structure	Level	Pattern	Image	Note
TS12: allantois	Present		1b
TS12: blood island	Present		1b
TS12: endocardial tube	Present		1b	Expression in cells fated to become the endocardium.

Structure	Level	Pattern	Image	Note
TS13: allantois	Present		1c
TS13: yolk sac blood vessel	Present		1c
TS13: dorsal aorta	Present		1c
TS13: heart	Present		1c

Structure	Level	Pattern	Image	Note
TS13: vascular system	Present	Regionally restricted	1d	Expression in pattern reflecting disturbed blood vessel development

Structure	Level	Pattern	Image	Note
TS13: embryo	Absent		1e

Structure	Level	Pattern	Image	Note
TS15: intersomitic blood vessel	Present		1g
TS15: head blood vessel	Present		1g	Expression in network of smaller vessels in head and trunk mesenchyme.
TS15: trunk blood vessel	Present		1g	Expression in network of smaller vessels in head and trunk mesenchyme.

Structure	Level	Pattern	Image	Note
TS18: intersomitic blood vessel	Present		1h
TS18: trunk blood vessel	Present	Regionally restricted	1h	Expression in branching network of smaller vessels formed by angiogenesis.

Structure	Level	Pattern	Image	Note
TS20: trunk blood vessel	Present	Regionally restricted	1i	Expression in branching vessels on surface of abdomen.
TS20: intersomitic blood vessel	Present		1i	Expression in vessels between somites.
TS20: vibrissa follicle	Strong		1i	High levels of expression in nascent vibrissa follicles.

Structure	Cell Type	Level	Pattern	Image	Note
TS12: yolk sac mesenchyme		Present		1j
TS12: vascular system	gut endothelial cell	Present	Regionally restricted	1j	Expression in endothelial cells around foregut.
TS12: cardiogenic plate	endocardial cell	Present	Regionally restricted	1j	Expression in presumptive endocardial cells of cardiogenic plate.

Structure	Cell Type	Level	Pattern	Image	Note
TS15: dorsal aorta	aortic endothelial cell	Present	Regionally restricted	1k	Expression in presumptive endocardial cells of cardiogenic plate.

Structure	Cell Type	Level	Pattern	Image	Note
TS15: intersomitic blood vessel	blood vessel endothelial cell	Present	Regionally restricted	1l	Expression in endothelial cells of intersomitic vessels.
TS15: yolk sac mesenchyme	endothelial cell	Present		1l	Expression in endothelial cells of yolk sac mesoderm.

Structure	Cell Type	Level	Pattern	Image	Note
TS15: intersomitic blood vessel	blood vessel endothelial cell	Present		1m	Expression in endothelial cells of intersomitic vessel.

Structure	Level	Pattern	Image	Note
TS22: vibrissa follicle	Present		2a
TS22: hair follicle	Present		2a	Expression in first wave of pelage hair follicles.

Structure	Level	Pattern	Image	Note
TS23: vibrissa follicle	Present			Expression in vibrissae follicle persisted until E15.0.

Structure	Level	Pattern	Image	Note
TS22: vibrissa dermal component	Present	Regionally restricted	2b	Expression in underlying mesenchyme adjacent to epithelial placode, persists in mesenchymal cells surrounding invaginating epithelium until dermal papillae stage.