Antibody:	anti-HNF4a (clone H1415)
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS15: pancreas primordium	Present	Regionally restricted	1A	Expression in most epithelial cells of the pancreatic bud. Constant level of expression in most pancreatic cells; strong expression in a few cells.

Structure	Level	Pattern	Image	Note
TS17: pancreas primordium	Present	Non-Uniform	1B	Constant level of expression in most pancreatic cells; strong expression in a few cells.

Structure	Level	Pattern	Image	Note
TS19: pancreas primordium	Present	Regionally restricted	1C	Constant level of expression in most pancreatic cells; strong expression in a few cells. Expresssion was more intense by E11.5.

Structure	Level	Pattern	Image	Note
TS20: pancreas	Present	Regionally restricted	1D	Constant level of expression in most pancreatic cells; strong expression in a few cells. Expression in cells with branching epithelial structures.

Structure	Level	Pattern	Image	Note
TS22: pancreas	Present	Regionally restricted	1E	Constant level of expression in most pancreatic cells; strong expression in a few cells. Expression in cells with branching epithelial structures.

Structure	Level	Pattern	Image	Note
TS23: pancreas	Present	Regionally restricted	1F	Strong expression in differentiated acinar cells with a polarized appearance; weak expression in duct-like epithelium. Strong expression in a few cells within islet-like cell clusters.

Structure	Level	Pattern	Image	Note
TS24: pancreas	Present	Regionally restricted	1G	Strong expression in differentiated acinar cells with a polarized appearance; weak expression in duct-like epithelium. Strong expression in a few cells within islet-like cell clusters.

Structure	Level	Pattern	Image	Note
TS25: pancreas	Present	Regionally restricted	1H	Weak expression in ductal cells and most of the islet cells. Strong expression in a few cells located at the periphery of the islets.

Structure	Level	Pattern	Image	Note
TS28: pancreatic duct	Weak		1I
TS28: islets of Langerhans	Present	Regionally restricted	1I	Weak expression in most of the islet cells. Strong expression in a few cells located at the periphery of the islets.