Probe:	Kcnq1 probe1
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS15: cardiac muscle tissue	Weak	Uniform	1A	Expression first detected along entire myocardial tube. No signs of antero-posterior polarity were observed.

Structure	Level	Pattern	Image	Note
TS15: cardiac muscle tissue	Weak	Uniform	1B	Expression first detected along entire myocardial tube. No signs of antero-posterior polarity were observed.

Structure	Level	Pattern	Image	Note
TS17: atrioventricular canal	Present			Similar expression levels in all cardiac compartments: antial and ventricular myocardium, and remnants of primary heart tube, atrioventricular canal and outflow tract.
TS17: atrium cardiac muscle	Present			Similar expression levels in all cardiac compartments: antial and ventricular myocardium, and remnants of primary heart tube, atrioventricular canal and outflow tract.
TS17: outflow tract	Present			Similar expression levels in all cardiac compartments: antial and ventricular myocardium, and remnants of primary heart tube, atrioventricular canal and outflow tract.
TS17: primitive ventricle cardiac muscle	Present			Similar expression levels in all cardiac compartments: antial and ventricular myocardium, and remnants of primary heart tube, atrioventricular canal and outflow tract.

Structure	Level	Pattern	Image	Note
TS20: atrium cardiac muscle	Present	Uniform	1C
TS20: ventricle cardiac muscle	Present	Uniform	1C

Structure	Level	Pattern	Image	Note
TS20: atrium cardiac muscle	Present	Uniform	1D
TS20: ventricle cardiac muscle	Present	Uniform	1D

Structure	Level	Pattern	Image	Note
TS24: atrium cardiac muscle	Present	Uniform	1E
TS24: ventricle cardiac muscle	Present	Uniform	1E
TS24: cardiac muscle tissue	Present	Regionally restricted	1E	Similar expression in atrioventricular junction as in myocardium elsewhere in heart.

Structure	Level	Pattern	Image	Note
TS24: atrium cardiac muscle	Present	Uniform	1F
TS24: ventricle cardiac muscle	Present	Uniform	1F
TS24: cardiac muscle tissue	Present	Regionally restricted	1F	Similar expression in atrioventricular junction as in myocardium elsewhere in heart.

Structure	Level	Pattern	Image	Note
TS26: atrium cardiac muscle	Present	Uniform
TS26: ventricle cardiac muscle	Present	Uniform