Antibody:	mAb 390
Detection system:	Secondary antibody coupled to fluorescein

Structure	Level	Pattern	Image	Note
TS13: endocardial tube	Present		7A	Expression in the endocardial cells of the developing heart.
TS13: extraembryonic component	Present		7A	Expression in the extra-embryonic mesoderm of the yolk sac corresponding to the region of blood island formation.
TS13: dorsal aorta	Present		7A
TS13: cardiac muscle tissue	Absent		7A

Structure	Level	Pattern	Image	Note
TS13: endocardial tube	Present	Regionally restricted	7B	Expression within the developing endothelium.
TS13: dorsal aorta	Present	Regionally restricted	7B	Expression within the developing endothelium, a single layer of cells surrounding the lumen of the dorsal aorta.
TS13: extraembryonic component	Present	Regionally restricted	7B	Expression in the extra-embryonic mesoderm of the yolk sac corresponding to the region of blood island formation.

Structure	Level	Pattern	Image	Note
TS19: endocardial lining	Strong		7C , 7D
TS19: endocardial cushion	Strong	Regionally restricted	7C , 7D	Expression on the endothelium of the endocardial cushions of the outflow tract.
TS19: outflow tract	Strong	Regionally restricted	7C , 7D	Expression on the endothelium of the endocardial cushions of the outflow tract.

Structure	Level	Pattern	Image	Note
TS12: blood island	Present	Regionally restricted	8B , 8D	Staining is restricted to the the endothelial lining of blood islands within the yolk sac mesoderm.
TS12: yolk sac	Present	Regionally restricted	8B , 8D	Staining is restricted to the the endothelial lining of blood islands within the yolk sac mesoderm.
TS12: yolk sac endoderm	Absent		8B , 8D