Antibody:	ARNT/HIF-1beta antibody
Detection system:	Secondary antibody coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS21: oral epithelium	Very strong		2A
TS21: incisor epithelium	Very strong	Regionally restricted	2A	Expression is in the invaginating epithelium and absent in the epithelium adjacent to the mesenchyme.
TS21: alveolar sulcus	Very strong	Regionally restricted	2A	Expression is in the labial sulcus.

Structure	Level	Pattern	Image	Note
TS21: molar dental lamina	Present		2B
TS21: oral epithelium	Present		2B
TS21: mandible	Very strong	Regionally restricted	2B	Expression is in the future alveolar bone area.
TS21: lower jaw molar mesenchyme	Absent		2B

Structure	Level	Pattern	Image	Note
TS22: jaw bone	Very strong	Regionally restricted	2C	Expression is in the area of the developing mandibular bone.
TS22: oral epithelium	Very strong		2C
TS22: tooth epithelium	Absent		2C
TS22: tooth mesenchyme	Absent		2C

Structure	Level	Pattern	Image	Note
TS25: incisor dental papilla	Present	Regionally restricted	2D	Present in odontoblasts, absent in the undifferentiated mesenchyme.
TS25: incisor epithelium	Present	Regionally restricted	2D	Present in amelolasts, absent in the undifferentiated epithelium.

Structure	Level	Pattern	Image	Note
TS27: jaw bone	Very strong		2E
TS27: oral epithelium	Very strong		2E
TS27: molar epithelium	Present	Regionally restricted	2E	Expression is in secretory amelolasts.
TS27: molar dental papilla	Trace	Regionally restricted	2E	Expression is in secretory odontoblasts and some expression in more centrally located mesenchyme.

Structure	Level	Pattern	Image	Note
TS28: stratum intermedium	Very strong		2F
TS28: enamel organ	Very strong	Regionally restricted	2F	Expression is in secretory ameloblasts.
TS28: dental papilla	Very strong	Regionally restricted	2F	Expression is in secretory odontoblasts.

Structure	Level	Pattern	Image	Note
TS21: perichondrium	Absent			Absent in the perichondrium of Meckel's cartilage.