Probe:	Pgk1 cDNA
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS26: lower jaw molar dental papilla	Present		1B
TS26: molar enamel organ	Present		1B

Structure	Level	Pattern	Image	Note
TS18: oral epithelium	Strong		2Aa
TS18: oral region	Strong	Regionally restricted	2Aa	Expression is in mesenchymal cells.

Structure	Level	Pattern	Image	Note
TS20: dental placode	Strong		2Ab
TS20: jaw primordium mesenchyme	Strong	Regionally restricted	2Ab	Expression is in the mesenchyme underlying the dental placode.

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar epithelium	Strong		2Ac
TS21: lower jaw mesenchyme	Strong	Regionally restricted	2Ac	Expression is in the mesenchymal cells underlying the tooth bud.
TS21: lower jaw molar	Strong	Regionally restricted	2Ac	Expression is at the tip of tooth bud.

Structure	Level	Pattern	Image	Note
TS22: lower jaw molar epithelium	Strong		2Ad
TS22: lower jaw mesenchyme	Strong	Regionally restricted	2Ad	Expression is in the mesenchymal cells underlying the tooth bud.

Structure	Level	Pattern	Image	Note
TS23: lower jaw molar dental papilla	Strong		2Ae
TS23: lower jaw molar enamel organ	Strong		2Ae
TS23: primary enamel knot	Weak		2Ae

Structure	Level	Pattern	Image	Note
TS24: lower jaw molar dental papilla	Strong		2Af
TS24: lower jaw molar enamel organ	Strong		2Af
TS24: enamel knot	Weak	Regionally restricted	2Af	Expression is in the primary enamel knot.
TS24: outer enamel epithelium	Absent		2Af

Structure	Level	Pattern	Image	Note
TS25: inner enamel epithelium	Strong		2Ag
TS25: stratum intermedium	Strong		2Ag
TS25: outer enamel epithelium	Absent		2Ag

Structure	Level	Pattern	Image	Note
TS26: cervical loop	Strong	Non-Uniform	2Ah	Expression in the cervical loop and the adjacent inner/outer enamel epithelia of the lingual side were stronger than those of the buccal side.
TS26: stratum intermedium	Strong		2Ah
TS26: inner enamel epithelium	Strong	Regionally restricted	2Ai , 2Ah	Expression is in the inner enamel epithelium of presumptive buccal cusp site and lingual side.
TS26: outer enamel epithelium	Strong	Regionally restricted	2Ah	Expression is in the outer enamel epithelium at the lingual side.
TS26: lower jaw molar mesenchyme	Strong	Regionally restricted	2Ah	Expression is in the mesenchyme of both buccal and lingual cusps sites.

Structure	Level	Pattern	Image	Note
TS18: forebrain	Strong		3A
TS18: retina	Strong		3A
TS18: oral region	Strong	Regionally restricted	3A	Expression is in the oral mucosa and the mesenchyme of maxilla and mandible.

Structure	Level	Pattern	Image	Note
TS20: forebrain	Strong		3B
TS20: mandibular process mesenchyme	Strong		3B
TS20: retina	Strong		3B

Structure	Level	Pattern	Image	Note
TS23: forebrain	Strong		3C
TS23: lower jaw molar epithelium	Strong		3C
TS23: masseter	Strong		3C
TS23: nasal epithelium	Strong		3C
TS23: retina	Strong		3C
TS23: tongue muscle	Strong		3C
TS23: upper jaw molar epithelium	Strong		3C
TS23: oral epithelium	Strong	Regionally restricted	3C	Expression is in the lingual epithelium.
TS23: Meckel's cartilage	Strong	Regionally restricted	3E , 3C

Structure	Level	Pattern	Image	Note
TS26: Meckel's cartilage	Present		3D
TS26: retina	Present		3D
TS26: enamel epithelium	Present		3D , 3F
TS26: lower jaw molar enamel organ	Present		3D , 3F
TS26: upper jaw molar enamel organ	Present		3D , 3F

Structure	Level	Pattern	Image	Note
TS23: heart mesenchyme	Present		3G

Structure	Level	Pattern	Image	Note
TS23: bronchiole epithelium	Present		3H

Structure	Level	Pattern	Image	Note
TS23: collecting duct	Present		3I

Structure	Level	Pattern	Image	Note
TS23: intestine epithelium	Present		3J

Structure	Level	Pattern	Image	Note
TS23: liver parenchyma	Present		3K