Probe:	Hey1 probe6
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS20: dental placode	Absent		1B

Structure	Level	Pattern	Image	Note
TS21: molar mesenchyme	Present	Regionally restricted	1E	Expressed on the buccal side of the dental mesenchyme surrounding the tooth bud.
TS21: mandible	Present		1E	Expressed in osteoblasts.

Structure	Level	Pattern	Image	Note
TS22: molar	Ambiguous		1H	Almost negative, or at a quite low level.

Structure	Level	Pattern	Image	Note
TS23: molar	Ambiguous		1K	Almost negative, or at a quite low level.

Structure	Level	Pattern	Image	Note
TS21: molar epithelium	Absent		1N
TS21: molar mesenchyme	Present	Regionally restricted	1N	Expressed on the buccal side of the dental mesenchyme surrounding the tooth bud.

Structure	Level	Pattern	Image	Note
TS24: molar dental papilla	Present	Regionally restricted	2B	Expressed in the pulp horn region.
TS24: molar enamel organ	Present	Regionally restricted	2B	Expressed in the inner enamel epithelium and preameloblasts.

Structure	Level	Pattern	Image	Note
TS25: molar dental papilla	Present	Regionally restricted	2F , 2F'	Expressed in the pulp horn region.
TS25: molar enamel organ	Present	Regionally restricted	2F , 2F'	Increased expression in the inner enamel epithelium and preameloblasts.
TS25: inner enamel epithelium	Present		2F , 2F'	Increased expression.

Structure	Level	Pattern	Image	Note
TS26: molar dental papilla	Present	Regionally restricted	2J' , 2J	Most intense expression in the undifferentiated dental pulp cells beneath the odontoblasts.
TS26: molar enamel organ	Present	Regionally restricted	2J' , 2J	Peak expression in the inner enamel epithelium and preameloblasts.
TS26: inner enamel epithelium	Present		2J , 2J'	Peak expression.

Structure	Level	Pattern	Image	Note
TS27: molar dental papilla	Strong	Regionally restricted	3B' , 3B	Expressed in the pulp horn region. Expressed in the subodontoblastic layer, not expressed in differentiated odontoblasts.
TS27: lower jaw incisor enamel organ	Present		3B
TS27: upper jaw incisor dental papilla	Present		3B

Structure	Level	Pattern	Image	Note
TS27: molar dental papilla	Strong	Regionally restricted	3F' , 3F	Expressed in the pulp horn region. Expressed in the subodontoblastic layer, not expressed in differentiated odontoblasts.

Structure	Level	Pattern	Image	Note
TS28: molar dental papilla	Present	Regionally restricted	3J' , 3J	Expressed in the pulp horn region. Expressed in the subodontoblastic layer, not expressed in differentiated odontoblasts.

Structure	Level	Pattern	Image	Note
TS26: lower jaw incisor dental papilla	Strong	Regionally restricted	5B2 , 5B4 , 5B3 , 5B1	Expressed in the subodontoblastic layer beneath differentiated odontoblasts, not expressed in differentiated odontoblasts or undifferentiated dental mesenchymal cells near the apical bud.
TS26: lower jaw incisor enamel organ	Weak	Regionally restricted	5B2 , 5B4 , 5B1	Slightly expressed in preameloblasts.

Structure	Level	Pattern	Image	Note
TS28: upper jaw incisor enamel organ	Weak	Regionally restricted	5F1	Slightly expressed in preameloblasts.

Structure	Level	Pattern	Image	Note
TS28: upper jaw incisor dental papilla	Strong	Regionally restricted	5F2	Expressed in the subodontoblastic layer beneath differentiated odontoblasts, not expressed in differentiated odontoblasts.

Structure	Level	Pattern	Image	Note
TS28: upper jaw incisor enamel organ	Weak	Regionally restricted	5J1	Slightly expressed in preameloblasts.

Structure	Level	Pattern	Image	Note
TS28: upper jaw incisor dental papilla	Strong	Regionally restricted	5J2	Expressed in the subodontoblastic layer beneath differentiated odontoblasts, not expressed in differentiated odontoblasts.