Probe:

Peg1 cDNA1

Structure	Level	Pattern	Image	Note
TS13: primitive ventricle cardiac muscle	Present		1A	Expression was concentrated in the ventricular myocardium and strongest in the trabeculae.
TS13: primitive ventricle endocardial tube	Present		1A
TS13: common atrial chamber cardiac muscle	Absent		1A , 1A'
TS13: atrioventricular canal cardiac muscle	Absent		1A' , 1A	Expression was absent from myocardium of the atrioventricular junction.
TS13: common atrial chamber endocardial tube	Present		1A , 1A'
TS13: outflow tract	Absent		1A

Structure	Level	Pattern	Image	Note
TS17: primitive ventricle cardiac muscle	Present		1B	Expression was concentrated in the ventricular myocardium and strongest in the trabeculae.
TS17: primitive ventricle endocardial lining	Present		1B
TS17: outflow tract cardiac muscle	Absent		1B
TS17: common atrial chamber cardiac muscle	Present	Regionally restricted	1B	Expression starts to appear in the myocardium of the future right atrial appendage but remains absent in the left appendage.
TS17: atrioventricular canal cardiac muscle	Absent		1B	Expression is absent from the myocardial component of the atrioventricular junction.

Structure	Level	Pattern	Image	Note
TS17: primitive ventricle cardiac muscle	Present		1C	Expression was concentrated in the ventricular myocardium and strongest in the trabeculae.
TS17: primitive ventricle endocardial lining	Present		1C
TS17: outflow tract cardiac muscle	Absent		1C
TS17: common atrial chamber cardiac muscle	Present	Regionally restricted	1C	Expression starts to appear in the myocardium of the future right atrial appendage but remains absent in the left appendage.
TS17: atrioventricular canal cardiac muscle	Absent		1C	Expression is absent from the myocardial component of the atrioventricular junction.

Structure	Level	Pattern	Image	Note
TS17: heart	Present		1D

Structure	Level	Pattern	Image	Note
TS19: atrium cardiac muscle	Present	Non-Uniform	1E	Expression was found in the myocardium of both the atrial appendages being, however, significantly stronger on the right than on the left.
TS19: endocardial lining	Present	Widespread	1E	Endocardial cells express throughout the heart.
TS19: visceral pericardium	Present		1E
TS19: atrioventricular endocardial cushion	Absent		1E

Structure	Level	Pattern	Image	Note
TS19: endocardial lining	Present	Widespread	1F	Endocardial cells express throughout the heart.
TS19: interventricular septum cardiac muscle	Absent		1F	Expression was not detected in the compact myocardium of the developing interventricular septum.
TS19: atrioventricular endocardial cushion	Absent		1F

Structure	Level	Pattern	Image	Note
TS19: endocardial lining	Present	Widespread	1G	Endocardial cells express throughout the heart.
TS19: interventricular septum cardiac muscle	Absent		1G	Expression was not detected in the compact myocardium of the developing interventricular septum.
TS19: outflow tract cardiac muscle	Absent		1G

Structure	Level	Pattern	Image	Note
TS19: atrium cardiac muscle	Present	Non-Uniform	1H	Expression was found in the myocardium of both the atrial appendages being, however, significantly stronger on the right than on the left.
TS19: trabecular myocardium	Present	Regionally restricted	1H	There is a sharp boundary of expression between the future right ventricle and the outflow tract, corresponding to the cranial extent of trabeculation.

Structure	Level	Pattern	Image	Note
TS20: ventricle cardiac muscle	Present	Regionally restricted	1I	Expression in the ventricular compact outer myocardium is either absent or much lower than in the trabeculae.
TS20: atrioventricular endocardial cushion	Absent		1I
TS20: interventricular septum cardiac muscle	Absent		1I
TS20: outflow tract cardiac muscle	Absent		1I
TS20: visceral pericardium	Present		1I

Structure	Level	Pattern	Image	Note
TS20: trabecular myocardium	Present	Regionally restricted	1J	Expression was increased in the atrial trabeculae, particularly in the right.

Structure	Level	Pattern	Image	Note
TS20: trabecular myocardium	Present	Non-Uniform	1K	There is a sharp boundary of expression between the future right ventricle and the outflow tract, corresponding to the cranial extent of trabeculation. Expression was increased in the atrial trabeculae, particularly in the right.

Structure	Level	Pattern	Image	Note
TS20: trabecular myocardium	Present	Non-Uniform	1L	There is a sharp boundary of expression between the future right ventricle and the outflow tract, corresponding to the cranial extent of trabeculation.

Structure	Level	Pattern	Image	Note
TS22: compact myocardium	Present	Regionally restricted	1M	Expression was detected in atria as well as ventricles.
TS22: trabecular myocardium	Present	Regionally restricted	1M	Expression was detected in atria as well as ventricles.

Structure	Level	Pattern	Image	Note
TS24: compact myocardium	Present	Regionally restricted	1N	Expression was detected in atria as well as ventricles.
TS24: trabecular myocardium	Present	Regionally restricted	1N	Expression was detected in atria as well as ventricles.

Structure	Level	Pattern	Image	Note
TS28: heart	Absent