Probe:	Hox-7 cDNA
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography
Assay notes:	E17.0 and E18.0 embryo heads were demineralized in 0.5M EDTA for 4 days, dehydrated through grades of ethanol, and cleared in chloroform prior to embedding in wax.

Structure	Level	Pattern	Image	Note
TS18: 1st branchial arch mandibular component mesenchyme derived from neural crest	Present	Regionally restricted	1C	The expression domain is more restricted to the distal mesenchyme (ie aboral side) of each arch.
TS18: 1st branchial arch maxillary component mesenchyme derived from neural crest	Present	Regionally restricted	1C	The expression domain is more restricted to the distal mesenchyme (ie aboral side) of each arch.
TS18: 2nd branchial arch mesenchyme derived from neural crest	Present	Regionally restricted	1C	The expression domain is more restricted to the distal mesenchyme (ie aboral side) of each arch.
TS18: 3rd branchial arch mesenchyme derived from neural crest	Present	Regionally restricted	1C	The expression domain is more restricted to the distal mesenchyme (ie aboral side) of each arch.
TS18: 4th branchial arch mesenchyme derived from neural crest	Present	Regionally restricted	1C	The expression domain is more restricted to the distal mesenchyme (ie aboral side) of each arch.

Structure	Level	Pattern	Image	Note
TS18: 1st branchial arch mandibular component mesenchyme	Present		2C
TS18: latero-nasal process mesenchyme	Present		2C
TS18: medial-nasal process mesenchyme	Present		2C
TS18: 1st branchial arch maxillary component mesenchyme	Present		2C

Structure	Level	Pattern	Image	Note
TS20: mandibular process mesenchyme	Present	Regionally restricted	5C	Expression is confined to the mesenchyme of the dental papilla and dental follicle.
TS20: maxillary process mesenchyme	Present	Regionally restricted	5C	Expression is confined to the mesenchyme of the dental papilla and dental follicle.

Structure	Level	Pattern	Image	Note
TS23: lower jaw molar dental follicle	Present		6C	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.
TS23: lower jaw molar dental papilla	Present		6C	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.
TS23: lower jaw molar enamel organ	Absent		6C

Structure	Level	Pattern	Image	Note
TS24: lower jaw molar dental follicle	Present		7C	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.
TS24: lower jaw molar dental papilla	Present		7C	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.
TS24: lower jaw molar enamel organ	Absent		7C

Structure	Level	Pattern	Image	Note
TS25: lower jaw molar dental follicle	Present		7F	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.
TS25: lower jaw molar dental papilla	Present		7F	Expression is restricted to the mesenchyme of the dental papilla and dental follicle.

Structure	Level	Pattern	Image	Note
TS26: lower jaw incisor dental papilla	Present		8C	Strong expression in the odontoblasts and subodontoblastic cells at the tips of the cusps, as well as in the dental follicle.
TS26: lower jaw incisor dental follicle	Present		8C	Strong expression in the odontoblasts and subodontoblastic cells at the tips of the cusps, as well as in the dental follicle.

Structure	Level	Pattern	Image	Note
TS20: maxillary process epithelium	Absent		10C
TS20: oral epithelium	Absent		10C
TS20: maxilla	Present	Regionally restricted	10C	Expression in the mesenchyme surrounding the invaginating dental epithelium, the distal mesenchyme of the lip, and the forming pre-maxillary bones.
TS20: maxillary process mesenchyme	Present	Regionally restricted	10C	Expression in the mesenchyme surrounding the invaginating dental epithelium, the distal mesenchyme of the lip, and the forming pre-maxillary bones.

Structure	Level	Pattern	Image	Note
TS21: lower jaw incisor mesenchyme	Present	Regionally restricted	11C	Expression in the incisor dental papilla and follicle.

Structure	Level	Pattern	Image	Note
TS24: lower jaw incisor dental follicle	Present		12B	Expression in the mesenchyme of the dental papilla and follicle.
TS24: lower jaw incisor dental papilla	Present		12B	Expression in the mesenchyme of the dental papilla and follicle.
TS24: upper jaw incisor dental papilla	Present		12B	Expression in the mesenchyme of the dental papilla and follicle.
TS24: dental sac	Present		12B	Expression in the mesenchyme of the upper jaw incisor dental follicle.
TS24: lower jaw incisor enamel organ	Absent		12B
TS24: upper jaw incisor enamel organ	Absent		12B
TS24: hair follicle	Present		12B
TS24: vibrissa	Present		12B

Structure	Level	Pattern	Image	Note
TS24: lower jaw incisor dental papilla	Present		13C
TS24: inner enamel epithelium	Absent		13C	Absent in the external enamel epithelia, stellate reticulum, and internal enamel epithelia.
TS24: lower jaw incisor enamel organ	Absent		13C	Absent in the external enamel epithelia, stellate reticulum, and internal enamel epithelia.
TS24: outer enamel epithelium	Absent		13C	Absent in the external enamel epithelia, stellate reticulum, and internal enamel epithelia.
TS24: stellate reticulum	Absent		13C	Absent in the external enamel epithelia, stellate reticulum, and internal enamel epithelia.

Structure	Level	Pattern	Image	Note
TS26: lower jaw incisor dental follicle	Present	Regionally restricted	14C	Expression in the mesenchyme of the dental papilla (including the odontoblasts) and follicle.
TS26: lower jaw incisor dental papilla	Present	Regionally restricted	14C	Expression in the mesenchyme of the dental papilla (including the odontoblasts) and follicle.

Structure	Level	Pattern	Image	Note
TS21: cranium	Present		15C
TS21: diencephalon meninges	Present		15C	Expression in the cellular precursors of the meninges.
TS21: hindbrain meninges	Present		15C	Expression in the cellular precursors of the meninges.
TS21: midbrain meninges	Present		15C	Expression in the cellular precursors of the meninges.
TS21: telencephalon meninges	Present		15C	Expression in the cellular precursors of the meninges.
TS21: lateral ventricle choroid plexus	Present	Regionally restricted	15C	Expression in the neuroepithelium of the lateral choroid plexus.

Structure	Level	Pattern	Image	Note
TS21: vomeronasal organ mesenchyme	Present	Regionally restricted	16C	Expression is restricted to the mesenchymal condensation on the nasal side, with only slight labeling of the mesenchyme adjacent to the thickened abnasal side.

Structure	Level	Pattern	Image	Note
TS23: vomeronasal organ mesenchyme	Present	Regionally restricted	16F	Expression is restricted to the mesenchymal condensation on the nasal side, with only slight labeling of the mesenchyme adjacent to the thickened abnasal side.

Structure	Level	Pattern	Image	Note
TS25: vomeronasal organ mesenchyme	Present	Regionally restricted	16I	Expression is restricted to the mesenchymal condensation on the nasal side, with only slight labeling of the mesenchyme adjacent to the thickened abnasal side.

Structure	Level	Pattern	Image	Note
TS20: adenohypophysis	Present
TS20: endolymphatic appendage	Absent