Antibody:	anti-beta4 subunit
Detection system:	Secondary antibody coupled to alkaline phosphatase

Structure	Level	Pattern	Image	Note
TS28: heart	Present	Uniform	2d	Homogeneous expression in the myocardium.
TS28: aorta	Absent		2d	Absent in smooth muscle cells.
TS28: pulmonary artery	Absent		2d	Absent in smooth muscle cells.

Structure	Level	Pattern	Image	Note
TS15: cardiac muscle tissue	Weak

Structure	Level	Pattern	Image	Note
TS17: common atrial chamber cardiac muscle	Present		4c
TS17: primitive ventricle cardiac muscle	Present		4c
TS17: atrioventricular canal	Weak		4c
TS17: outflow tract	Weak		4c
TS17: heart	Present	Regionally restricted	4c	Absent in atrioventricular cushions.

Structure	Level	Pattern	Image	Note
TS20: cardiac muscle tissue	Present		4f

Structure	Level	Pattern	Image	Note
TS20: cardiac muscle tissue	Present		4i , 4l
TS20: atrioventricular canal	Weak		4i , 4l

Structure	Level	Pattern	Image	Note
TS23: atrium cardiac muscle	Present	Uniform	5b , 5d
TS23: ventricle cardiac muscle	Present	Uniform	5b , 5d
TS23: heart	Weak	Regionally restricted	5b , 5d	Expression is weak in the ventricular conduction system.

Structure	Level	Pattern	Image	Note
TS23: atrium cardiac muscle	Present	Uniform	5f
TS23: ventricle cardiac muscle	Present	Uniform	5f
TS23: heart	Weak	Regionally restricted	5f	Expression is reduced in the atrioventricular node and the bundle of His.

Structure	Level	Pattern	Image	Note
TS26: heart	Present	Uniform	5h