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

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

Structure	Level	Pattern	Image	Note
TS18: oral region	Present	Regionally restricted	2Ba	Expression is even in the cells of the mandibular arch containing epithelial and mesenchymal cells.

Structure	Level	Pattern	Image	Note
TS20: jaw primordium mesenchyme	Strong	Regionally restricted	2Bb	Expression is in the mesenchymal cells facing the thickened epithelium.
TS20: dental placode	Absent		2Bb

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar	Strong		2Bc	Expression was higher at the tip.
TS21: lower jaw mesenchyme	Weak	Regionally restricted	2Bc	Expression is in the mesenchyme underlying the tooth bud.

Structure	Level	Pattern	Image	Note
TS22: lower jaw molar	Strong		2Bd	Expression was higher at the tip.
TS22: lower jaw mesenchyme	Weak	Regionally restricted	2Bd	Expression is in the mesenchyme underlying the tooth bud.

Structure	Level	Pattern	Image	Note
TS23: enamel organ	Strong		2Be
TS23: lower jaw mesenchyme	Absent		2Be
TS23: primary enamel knot	Absent		2Be

Structure	Level	Pattern	Image	Note
TS24: cervical loop	Strong		2Bf
TS24: enamel organ	Strong		2Bf
TS24: inner enamel epithelium	Strong		2Bf
TS24: stratum intermedium	Strong		2Bf
TS24: outer enamel epithelium	Strong	Regionally restricted	2Bf	Expression is adjacent to the cervical loop.
TS24: lower jaw molar dental papilla	Weak		2Bf
TS24: lower jaw mesenchyme	Absent		2Bf

Structure	Level	Pattern	Image	Note
TS25: cervical loop	Strong		2Bg
TS25: inner enamel epithelium	Strong		2Bg
TS25: stratum intermedium	Strong		2Bg
TS25: outer enamel epithelium	Weak	Regionally restricted	2Bg	Expression is adjacent to both buccal and lingual cervical loops.
TS25: lower jaw molar mesenchyme	Weak	Regionally restricted	2Bg	Expression is mesenchymal cells facing the inner enamel epithelium.

Structure	Level	Pattern	Image	Note
TS26: cervical loop	Strong	Non-Uniform	2Bi , 2Bh	Expression in the cervical loop and the adjacent inner enamel epithelia of the lingual side were stronger than those of the buccal side.
TS26: stratum intermedium	Strong	Non-Uniform	2Bi , 2Bh	Expression in the cervical loop and the adjacent inner enamel epithelia of the lingual side were stronger than those of the buccal side.
TS26: inner enamel epithelium	Strong	Regionally restricted	2Bi , 2Bh	Expression is in the inner enamel epithelium of presumptive buccal cusp site (stronger) and the adjacent site of lingual cervical loop.
TS26: molar mesenchyme	Strong	Regionally restricted	2Bh	Expression is in the mesenchyme underlying the stratum intermedium.
TS26: outer enamel epithelium	Present	Regionally restricted	2Bh	Expression is adjacent to the cervical loops.