Antibody:

anti-beta domain

Structure	Level	Pattern	Image	Note
TS15: heart atrium	Present	Regionally restricted	4A	Expression is surrounding the endocardial and myocardial cells.
TS15: primitive ventricle	Present	Regionally restricted	4A	Expression is surrounding the endocardial and myocardial cells.

Structure	Level	Pattern	Image	Note
TS17: primitive ventricle	Present	Regionally restricted	4B	Expression is surrounding the endocardial cells.
TS17: heart atrium	Weak		4B
TS17: endocardial cushion	Present		4B
TS17: interatrial septum	Present		4B

Structure	Level	Pattern	Image	Note
TS19: atrioventricular endocardial cushion	Present	Regionally restricted	4C
TS19: interatrial septum	Present	Regionally restricted	4C	Expression is in the mesenchymal cells at the crest of the atrial septum.
TS19: right ventricle cardiac muscle	Strong		4C
TS19: left ventricle cardiac muscle	Present		4C

Structure	Level	Pattern	Image	Note
TS19: interatrial septum	Present	Regionally restricted	4D	Expression is in the mesenchymal cells at the crest of the atrial septum.

Structure	Level	Pattern	Image	Note
TS19: outflow tract	Present	Regionally restricted	4E	Expression is in the truncal ridges.

Structure	Level	Pattern	Image	Note
TS20: interventricular septum	Present	Regionally restricted	4F	Expression is surrounding the endocardial cells on the crest of the ventricular septum.
TS20: ventricle cardiac muscle	Weak	Regionally restricted	4F

Structure	Level	Pattern	Image	Note
TS21: atrioventricular valve	Present		4G
TS21: heart valve	Present	Regionally restricted	4G	Expression is in the venous valve.
TS21: ventricle cardiac muscle	Weak		4G