Probe:	R-spondin1 probe1
Probe preparation:	labelled with S35 RNA
Visualized with:	Autoradiography

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

Structure	Level	Pattern	Image	Note
TS19: jaw primordium epithelium	Weak	Regionally restricted	1B	Weak expression in both molar tooth epithelium and mesenchyme.
TS19: jaw primordium mesenchyme	Weak	Regionally restricted	1B	Weak expression in both molar tooth epithelium and mesenchyme.

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

Structure	Level	Pattern	Image	Note
TS22: molar mesenchyme	Weak		1D
TS22: cervical loop	Weak	Regionally restricted	1D	Weak expression in cervical loop epithelium.

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

Structure	Level	Pattern	Image	Note
TS26: cervical loop	Weak	Regionally restricted	3A	Weak expression in lingual aspect of cervical loop.

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