Probe:	Rpl21 cDNA1
Probe preparation:	Antisense labelled with digoxigenin RNA
Visualized with:	Alkaline phosphatase

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch mandibular component	Present	Regionally restricted	2A	Expression is in the presumptive dental epithelium and mesenchyme of the first molar.

Structure	Level	Pattern	Image	Note
TS20: mandibular process	Present	Regionally restricted	2B	Expression is in the thickened epithelium and in the underlying dental mesenchyme of the first molar.

Structure	Level	Pattern	Image	Note
TS22: lower jaw incisor epithelium	Present	Regionally restricted	2C	Expression is in the epithelium bud excluding the primary enamel knot.
TS22: lower jaw incisor enamel organ	Absent		2C
TS22: primary enamel knot	Absent		2C

Structure	Level	Pattern	Image	Note
TS23: cervical loop	Strong		2D	Expression is in epithelial cells of the enamel organ and in the cervical loop containing both the inner and outer epithelia and is weak in the primary enamel knot.
TS23: inner enamel epithelium	Strong		2D	Expression is in epithelial cells of the enamel organ and in the cervical loop containing both the inner and outer epithelia and is weak in the primary enamel knot.
TS23: lower jaw molar enamel organ	Strong		2D	Expression is in epithelial cells of the enamel organ and in the cervical loop containing both the inner and outer epithelia and is weak in the primary enamel knot.
TS23: outer enamel epithelium	Strong		2D	Expression is in epithelial cells of the enamel organ and in the cervical loop containing both the inner and outer epithelia and is weak in the primary enamel knot.
TS23: lower jaw molar dental papilla	Weak		2D
TS23: primary enamel knot	Weak		2D

Structure	Level	Pattern	Image	Note
TS24: inner enamel epithelium	Strong	Regionally restricted	2E	Expression is in the inner enamel epithelial cells and parts of the outer enamel epithelial cells.
TS24: lower jaw molar enamel organ	Strong	Regionally restricted	2E	Expression is in the inner enamel epithelial cells and parts of the outer enamel epithelial cells.
TS24: outer enamel epithelium	Strong	Regionally restricted	2E	Expression is in the inner enamel epithelial cells and parts of the outer enamel epithelial cells.
TS24: lower jaw molar dental papilla	Weak		2E

Structure	Level	Pattern	Image	Note
TS25: cervical loop	Strong	Regionally restricted	2F	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS25: inner enamel epithelium	Strong	Regionally restricted	2F	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS25: lower jaw molar enamel organ	Strong	Regionally restricted	2F	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS25: outer enamel epithelium	Strong	Regionally restricted	2F	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS25: stratum intermedium	Strong	Regionally restricted	2F	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS25: lower jaw molar dental papilla	Strong	Regionally restricted	2F	Expression is in the cuspal mesenchyme.

Structure	Level	Pattern	Image	Note
TS26: cervical loop	Strong		2G	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS26: inner enamel epithelium	Strong		2G	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS26: lower jaw molar enamel organ	Strong		2G	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS26: outer enamel epithelium	Strong		2G	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.
TS26: stratum intermedium	Strong		2G	Expression is in the inner enamel epithelium and the stratum intermedium and in the outer enamel epithelium of the cervical loop.

Structure	Level	Pattern	Image	Note
TS20: diencephalon	Strong		3A
TS20: telencephalon	Strong		3A

Structure	Level	Pattern	Image	Note
TS24: nose	Strong	Regionally restricted	3B	Expression is in the nasal wall.

Structure	Level	Pattern	Image	Note
TS24: retina	Strong		3C

Structure	Level	Pattern	Image	Note
TS24: mandible	Strong	Regionally restricted	3D	Expression is in membraneous bone.
TS24: Meckel's cartilage	Strong		3D

Structure	Level	Pattern	Image	Note
TS25: Harderian gland	Strong		3E

Structure	Level	Pattern	Image	Note
TS26: sublingual gland epithelium	Strong		3F

Structure	Level	Pattern	Image	Note
TS26: epidermis	Strong		3G
TS26: hair follicle	Strong		3G