Probe:	flk-1 probe4
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS22: heart ventricle	Strong		3A
TS22: lung	Strong		3A
TS22: meninges	Strong		3A
TS22: brain	Present		3A
TS22: liver	Present		3A
TS22: mandible	Present		3A
TS22: axial skeleton	Present	Regionally restricted	3A	Thin strands of expression in intersegmental regions of vertebra.
TS22: dorsal aorta	Present	Regionally restricted	3A	Expression at inner surface of atrium and aorta.
TS22: heart atrium	Present	Regionally restricted	3A	Expression at inner surface of atrium and aorta.

Structure	Level	Pattern	Image	Note
TS22: dorsal aorta	Present	Regionally restricted	3B	Expression in endothelial cells of wall of aorta. No expression in muscular layer.

Structure	Level	Pattern	Image	Note
TS22: lung vascular element	Present	Regionally restricted	3D	Expression in structures likely representing peribronchial capillaries.

Structure	Level	Pattern	Image	Note
TS22: bronchus epithelium	Absent		3F

Structure	Level	Pattern	Image	Note
TS22: heart blood vessel	Present	Regionally restricted	3H	Expression in presumptive ventricular capillaries.
TS22: atrium endocardial lining	Present		3H

Structure	Level	Pattern	Image	Note
TS19: blood vessel	Strong	Regionally restricted	4A	High expression in perineural vascular plexus and in structures resembling invading vascular sprouts.

Structure	Level	Pattern	Image	Note
TS22: brain blood vessel	Strong	Regionally restricted	4B	Large amounts of expression in numerous radial vessels as well as branching vessels of the intraneural plexus.

Structure	Level	Pattern	Image	Note
TS28: brain blood vessel	Strong	Regionally restricted	4C	Strong expression in vessels of intraneural plexus.

Structure	Level	Pattern	Image	Note
TS28: midbrain	Weak		4D	Very low expression in brain.
TS28: choroid plexus	Present		4D	Expression restricted mainly to choroid plexus.

Structure	Level	Pattern	Image	Note
TS28: choroid plexus stroma	Present	Regionally restricted	4E	Expression in cells of inner vascular layer.
TS28: choroid plexus epithelium	Absent		4E

Structure	Level	Pattern	Image	Note
TS28: choroid plexus stroma	Present	Regionally restricted	4F	Expression in cells of inner vascular layer.
TS28: choroid plexus epithelium	Absent		4F

Structure	Level	Pattern	Image	Note
TS28: decidua	Present	Regionally restricted	6A	Expression in maternal blood vessels in decidua.

Structure	Level	Pattern	Image	Note
TS13: allantois	Present		6A
TS13: trophectoderm	Present		6A
TS13: yolk sac	Present		6A
TS13: embryo mesenchyme	Present		6A

Structure	Level	Pattern	Image	Note
TS28: blood vessel endothelium	Strong	Regionally restricted	6B	In decidua, high levels of expression in inner lining of blood vessels.

Structure	Level	Pattern	Image	Note
TS15: yolk sac mesenchyme	Present		6C	Expression confined to mesodermal layer, where hemangioblast differentiate.
TS15: trophectoderm	Present		6C

Structure	Level	Pattern	Image	Note
TS15: yolk sac mesenchyme	Present	Regionally restricted	6D	Expression in peripheral angioblasts in blood islands.