Antibody:	PGCA Antibody (PGCA-101AP)
Detection system:	Secondary antibody coupled to Alexa Fluor 488

Structure	Level	Pattern	Image	Note
TS19: left ventricle cardiac muscle	Present	Regionally restricted	1D , 1C	The percentage of positive cells was 12.6-fold higher in the trabecular myocardium compared to the compact myocardium (72.7% vs. 12.8%, summarized in Fig 1I).

Structure	Level	Pattern	Image	Note
TS19: left ventricle cardiac muscle	Present		1O	Staining patterns in parallel sections indicated a clear overlap between Npr1/NPRA and Gja5/Cx40 expression in the primitive ventricular conduction system forming trabecular zones.

Structure	Level	Pattern	Image	Note
TS19: right ventricle cardiac muscle	Present		S1D , S1B	The percentage of positive cells was significant higher in the trabecular myocardium compared to the compact myocardium.
TS19: interventricular septum cardiac muscle	Present		S1D , S1B	The percentage of positive cells was significant higher compared to the compact myocardium.