Probe:	Lhx6 cDNA4
Probe preparation:	Antisense labelled with digoxigenin RNA
Visualized with:	Alkaline phosphatase

Structure	Level	Pattern	Image	Note
TS15: 1st branchial arch	Weak	Regionally restricted

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch	Strong	Regionally restricted	3A	High levels of expression restricted to subdomains of the first branchial arch.

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch mandibular component	Present	Regionally restricted	3C	Expression in oral (future odontogenic) aspect of mandibular process and part of maxillary process, subdomains bordering the cleft separating the two facial primordia.
TS17: 1st branchial arch maxillary component	Present	Regionally restricted	3C	Expression in oral (future odontogenic) aspect of mandibular process and part of maxillary process, subdomains bordering the cleft separating the two facial primordia.

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch mandibular component mesenchyme derived from neural crest	Present		3E
TS17: 1st branchial arch maxillary component mesenchyme derived from neural crest	Present		3E
TS17: oral epithelium	Absent		3E

Structure	Level	Pattern	Image	Note
TS19: 1st branchial arch	Present	Regionally restricted		Authors report expression in a pattern similar to that of the previous stage.

Structure	Level	Pattern	Image	Note
TS20: jaw primordium mesenchyme	Present	Uniform	4A	Uniform expression in ectomesenchyme adjoining the oral epithelium.
TS20: oral epithelium	Absent		4A

Structure	Level	Pattern	Image	Note
TS21: lower jaw mesenchyme	Present	Regionally restricted	4C	Expression downregulated in most regions of maxillary and mandibular mesenchyme, but maintained and/or upregulated in mesenchyme adjacent to epithelial thickenings constituting the tooth primordia.
TS21: upper jaw mesenchyme	Present	Regionally restricted	4C	Expression downregulated in most regions of maxillary and mandibular mesenchyme, but maintained and/or upregulated in mesenchyme adjacent to epithelial thickenings constituting the tooth primordia.

Structure	Level	Pattern	Image	Note
TS22: tooth mesenchyme	Strong		4E	At subsequent stages, high levels of expression restricted to mesenchymal component of developing tooth.
TS22: tooth epithelium	Absent		4E

Structure	Level	Pattern	Image	Note
TS19: telencephalon	Present	Regionally restricted	5A	Expression in the medial ganglionic eminence, mainly in the subventricular and submantle zones. No expression in the lateral ganglionic eminence.

Structure	Level	Pattern	Image	Note
TS21: medial ganglionic eminence	Present	Regionally restricted	5B	Expression in the medial ganglionic eminence, mainly in the subventricular and submantle zones.
TS21: medial ganglionic eminence subventricular zone	Present		5B
TS21: lateral ganglionic eminence	Absent		5B

Structure	Level	Pattern	Image	Note
TS23: medial ganglionic eminence	Present	Regionally restricted	5C	Expression in the medial ganglionic eminence, mainly in the subventricular and submantle zones.
TS23: medial ganglionic eminence subventricular zone	Present		5C
TS23: lateral ganglionic eminence	Absent		5C

Structure	Level	Pattern	Image	Note
TS19: forebrain	Present	Regionally restricted		Domain of expression extends up to a group of cells expressing Fgff8 in the midline of the basal forebrain.