Probe:	Hoxa3 probe6
Probe preparation:	Antisense labelled with digoxigenin RNA
Visualized with:	Alkaline phosphatase

Structure	Level	Pattern	Image	Note
TS15: head mesenchyme derived from neural crest	Present	Regionally restricted	6E	Expression is in the crest cells associated with the IXth and Xth nerves.
TS15: mesenchyme derived from head mesoderm	Weak		6E

Structure	Level	Pattern	Image	Note
TS15: head mesenchyme derived from neural crest	Present	Regionally restricted	6F	Signals are detected around the IXth nerve distal ganglion anlage, but there is no signal between the proximal and distal ganglion anlagen of the IXth nerve.

Structure	Level	Pattern	Image	Note
TS14: 1st branchial arch mandibular component mesenchyme derived from neural crest	Strong	Regionally restricted	8A	The cells form a stream from the fusion point of the neural tube to beneath the placode.
TS14: 1st branchial arch mandibular component mesenchyme derived from head mesoderm	Moderate		8A
TS14: neural tube	Moderate		8A

Structure	Level	Pattern	Image	Note
TS14: 1st branchial arch mandibular component mesenchyme derived from neural crest	Strong	Regionally restricted	8B	Expression is in cells in the most dorsal region toward the placode.

Structure	Level	Pattern	Image	Note
TS14: 1st branchial arch mandibular component mesenchyme derived from neural crest	Present	Regionally restricted	8C	There is no expression near the placode, but there is expression in the dorsal region revealing a slightly caudal migration of the crest cells.