Antibody:	anti-KCNQ1
Detection system:	Secondary antibody coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS15: atrium cardiac muscle	Present	Uniform	2B
TS15: primitive ventricle cardiac muscle	Present	Uniform	2B

Structure	Level	Pattern	Image	Note
TS17: atrium cardiac muscle	Present	Uniform
TS17: primitive ventricle cardiac muscle	Present	Uniform

Structure	Level	Pattern	Image	Note
TS20: atrium cardiac muscle	Present	Uniform	2D
TS20: ventricle cardiac muscle	Present	Uniform	2D

Structure	Level	Pattern	Image	Note
TS22: atrium cardiac muscle	Present	Uniform
TS22: ventricle cardiac muscle	Present	Uniform

Structure	Level	Pattern	Image	Note
TS23: atrium cardiac muscle	Present	Uniform
TS23: ventricle cardiac muscle	Present	Uniform

Structure	Level	Pattern	Image	Note
TS24: atrium cardiac muscle	Present	Uniform	2E
TS24: ventricle cardiac muscle	Present	Uniform	2E

Structure	Level	Pattern	Image	Note
TS26: atrium cardiac muscle	Present	Uniform	2F
TS26: ventricle cardiac muscle	Present	Uniform	2F
TS26: atrioventricular bundle	Strong		2F	Enhanced expression preferentially in the ventricular conduction system, i.e. bundle of His.
TS26: impulse conducting system	Strong		2F	Enhanced expression preferentially in the ventricular conduction system, i.e. bundle of His.