Antibody:	anti-beta-catenin (#610153), clone 14
Detection system:	Secondary antibody coupled to Cy3

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar epithelium	Present	Uniform	2A

Structure	Level	Pattern	Image	Note
TS22: outer enamel epithelium	Present		2B	Decreased expression compared with other parts.
TS22: inner enamel epithelium	Present		2B
TS22: stellate reticulum	Present		2B
TS22: stratum intermedium	Present		2B

Structure	Level	Pattern	Image	Note
TS23: inner enamel epithelium	Present		2C	Expression remained constant.
TS23: stellate reticulum	Present		2C	Expression remained constant.
TS23: stratum intermedium	Present		2C	Expression remained constant.
TS23: outer enamel epithelium	Present		2C	Increased expression compared with that of E14.5.
TS23: lower jaw molar	Present	Regionally restricted	2C	Expressed in the mesenchymal cells of the dental pulp.

Structure	Level	Pattern	Image	Note
TS24: inner enamel epithelium	Present		2D	Expression remained constant.
TS24: stellate reticulum	Present		2D	Expression remained constant.
TS24: stratum intermedium	Present		2D	Expression remained constant.
TS24: outer enamel epithelium	Present		2D	Increased expression compared with that of E14.5.
TS24: lower jaw molar	Present	Regionally restricted	2D	Expressed in the mesenchymal cells of the dental pulp.

Structure	Cell Type	Level	Pattern	Image	Note
TS26: inner enamel epithelium	ameloblast	Present		2E	Expression was apicolateral and basolateral.
TS26: inner enamel epithelium	preameloblast	Present		2E	Expression was apicolateral and basolateral.
TS26: dental pulp		Present		2E	Expressed in the mesenchymal cells.

Structure	Cell Type	Level	Pattern	Image	Note
TS26: inner enamel epithelium	ameloblast	Present		2F	Expression was apicolateral and basolateral.
TS26: inner enamel epithelium	preameloblast	Present		2F	Expression was apicolateral and basolateral.
TS26: dental pulp		Present		2F	Expressed in the mesenchymal cells.