Reporter:	lacZ
	Direct Detection

Structure	Level	Pattern	Image	Note
TS15: 1st branchial arch	Present		3A
TS15: future midbrain	Present	Regionally restricted	3A	Expression is seen in the anterior and posterior neuropores. There is strong staining at the midline of the mesencephalon roof.

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch mandibular component	Present	Widespread	3B	Expression is throughout the developing mandibular and maxillary processes.
TS17: 1st branchial arch maxillary component	Present	Widespread	3B	Expression is throughout the developing mandibular and maxillary processes.

Structure	Level	Pattern	Image	Note
TS17: olfactory placode	Present			Staining of intermediate intensity is seen in the olfactory pit.
TS17: optic cup	Present			Staining of intermediate intensity is seen in the eye cup.

Structure	Level	Pattern	Image	Note
TS19: maxillary process	Present	Non-Uniform	3C	Expression is strongest at the distal half of the maxillary process.

Structure	Level	Pattern	Image	Note
TS19: mandibular process	Present	Non-Uniform		Expression is strongest at the distal half of the mandibular process.

Structure	Level	Pattern	Image	Note
TS21: mystacial pad	Present		3D	Staining is strongest in the mystacial pad; it is less distinct in the surrounding regions.

Structure	Level	Pattern	Image	Note
TS21: naris	Strong			Intense staining in the nostrils.
TS21: ear	Strong
TS21: perioptic mesenchyme	Strong			Intense staining in the mesenchyme surrounding the eyeball.

Structure	Level	Pattern	Image	Note
TS19: maxillary process	Present	Widespread	4A	Staining is seen in nearly every cell in the distal end of the maxillary process.
TS19: head surface ectoderm	Strong	Regionally restricted	4A	Expression is seen in the presumptive epidermis of the maxillary process.
TS19: head mesenchyme derived from neural crest	Strong	Regionally restricted	4A	Expression is seen in the superficial (derived from neural crest) mesenchyme of the maxillary process.
TS19: mesenchyme derived from head mesoderm	Strong	Regionally restricted	4A	Expression is seen in the deep (derived from mesoderm) mesenchyme of the maxillary process.

Structure	Level	Pattern	Image	Note
TS19: maxillary process	Present	Widespread	4B	Nearly every cell in the distal end of the maxillary process is stained.

Structure	Level	Pattern	Image	Note
TS19: cornea epithelium	Present			Staining is seen in the corneal ectoderm.
TS19: nasal pit	Present			Staining is seen in the nostrils.
TS19: oral epithelium	Present
TS19: mandibular process	Present	Widespread		Staining is seen in nearly every cell in the distal end of the mandibular process.

Structure	Level	Pattern	Image	Note
TS20: maxillary process mesenchyme	Strong		4C
TS20: maxillary process epithelium	Present		4C	Staining in the skin is weakening relative to earlier levels.

Structure	Level	Pattern	Image	Note
TS20: head mesenchyme	Present		4D	Staining is seen in the mesenchyme surrounding the anterior edge of the trigeminal.
TS20: trigeminal ganglion	Present	Single cells	4D	Staining is seen in a few non-neuronal cells within the ganglion.

Structure	Level	Pattern	Image	Note
TS21: mystacial pad	Present	Regionally restricted	4E	Expression is confined to the mesenchyme underlying the skin (and the surrounding whisker follicles).

Structure	Level	Pattern	Image	Note
TS21: mystacial pad	Present	Regionally restricted	4F	Expression is confined to the mesenchyme surrounding the whisker follicles (and underlying the skin of the mystacial pad).

Structure	Level	Pattern	Image	Note
TS21: eye	Present			Staining is seen in the eyeball.