Probe:	Osr2 probe3
Probe preparation:	Antisense labelled with P32 RNA

Structure	Level	Pattern	Image	Note
TS20: mandibular process mesenchyme	Strong		3A
TS20: primary palate mesenchyme	Strong		3A
TS20: maxillary process mesenchyme	Strong	Regionally restricted	3A	Strong expression in mesenchyme of secondary palate.
TS20: nasal mesenchyme	Strong	Regionally restricted	3A	Strong expression in mesenchyme surrounding olfactory epithelium.
TS20: esophagus mesenchyme	Strong		3A	Strong expression in mesenchyme surrounding esophagus.
TS20: central nervous system	Absent		3A	Authors report no expression in central nervous system at all embryonic stages examined.

Structure	Level	Pattern	Image	Note
TS20: maxillary process mesenchyme	Strong	Regionally restricted	3B	Strong expression in mesenchyme of secondary palate.
TS20: tongue mesenchyme	Strong		3B
TS20: eye	Strong	Regionally restricted	3B	High expression in mesenchyme as well as epithelia in regions surrounding the developing eye.

Structure	Level	Pattern	Image	Note
TS22: nasal mesenchyme	Strong	Regionally restricted	3C	Strong expression in mesenchyme surrounding olfactory epithelium.
TS22: esophagus mesenchyme	Strong		3C	Strong expression in mesenchyme surrounding esophagus.
TS22: palatal shelf mesenchyme	Weak		3C	Decreased expression in palatal shelves and tongue.
TS22: tongue mesenchyme	Weak		3C	Decreased expression in palatal shelves and tongue.
TS22: thyroid gland	Strong	Regionally restricted	3C	Intense expression in mesenchyme condensing around developing thyroid gland.

Structure	Level	Pattern	Image	Note
TS22: eye mesenchyme	Present	Regionally restricted	3D	Expression in mesenchyme around optic cup.
TS22: cornea epithelium	Present		3D	Expression in eyelid and corneal epithelia.
TS22: eyelid epithelium	Present		3D	Expression in eyelid and corneal epithelia.
TS22: palatal shelf mesenchyme	Weak		3D	Decreased expression in palatal shelves and tongue.
TS22: tongue mesenchyme	Weak		3D	Decreased expression in palatal shelves and tongue.
TS22: molar mesenchyme	Trace	Regionally restricted	3D	Intense expression in mesenchyme condensing around first molar tooth buds.

Structure	Level	Pattern	Image	Note
TS22: mesonephros	Strong	Regionally restricted	3E	Strong expression in mesenchyme surrounding epithelial ducts of the mesonephros.

Structure	Level	Pattern	Image	Note
TS22: mesenchyme of metanephros	Strong	Regionally restricted	3F	Strong expression in a subset of mesenchymal cells surrounding epithelial tubules of the metanephros.