Probe:	R-spondin4 probe1
Probe preparation:	labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS17: oral region	Absent		1P	No expression in presumptive molar tooth region.

Structure	Level	Pattern	Image	Note
TS19: jaw primordium	Absent		1Q	No expression in presumptive molar region.

Structure	Level	Pattern	Image	Note
TS21: molar epithelium	Weak	Regionally restricted	1R	Weak expression in basal epithelium of tooth bud.
TS21: molar mesenchyme	Weak		1R

Structure	Level	Pattern	Image	Note
TS22: molar dental papilla	Present		1S
TS22: cervical loop	Weak	Regionally restricted	1S	Weak expression in cervical loop epithelium.

Structure	Level	Pattern	Image	Note
TS26: molar dental papilla	Present	Regionally restricted	1T	Strong expression in developing pulp. Weak expression in odontoblasts.
TS26: molar enamel organ	Weak	Regionally restricted	1T	Weak expression in ameloblasts.

Structure	Level	Pattern	Image	Note
TS26: cervical loop	Present	Regionally restricted	3C	Expression in lingual aspect of cervical loop.
TS26: incisor dental papilla	Present	Regionally restricted	3C	Expression in lingual side of developing dental pulp.
TS26: incisor mesenchyme	Weak	Regionally restricted	3C	Weak expression in mesenchyme facing the cervical loop.

Structure	Level	Pattern	Image	Note
TS21: jaw	Present	Regionally restricted	8C	Expression in diastema (tooth less region) anterior to first molar tooth germs.