Probe:	Fkh1/Mf1 cDNA
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS19: head mesenchyme	Present	Regionally restricted	1A	Some expression localized in calvarial mesenchyme.

Structure	Level	Pattern	Image	Note
TS20: chondrocranium	Strong		1B	Intense expression in condensing prechondrogenic calvarial mesenchyme.
TS20: head mesenchyme	Strong	Regionally restricted	1B	Intense expression in prechondrogenic condensations of developing cranial base and nasal cartilages.
TS20: meninges	Strong		1B	Strong expression in primitive meningeal layers.

Structure	Level	Pattern	Image	Note
TS21: chondrocranium pre-cartilage condensation	Strong		1C	Intense expression in condensing prechondrogenic calvarial mesenchyme.
TS21: head mesenchyme	Strong	Regionally restricted	1C	Expression in calvarial mesenchyme between brain and surface ectoderm. Intense expression in precondrogenic condensations of developing cranial base and nasal cartilages.
TS21: frontal bone primordium	Weak		1C	Minimal expression in mesenchymal condensation of frontal bone.
TS21: meninges	Present		1C	Strong expression in primitive meningeal layers.

Structure	Level	Pattern	Image	Note
TS23: chondrocranium bone	Present	Regionally restricted	1D	Expression localized to osteoblasts and periosteum of calvarial bones.
TS23: meninges	Present		1D

Structure	Level	Pattern	Image	Note
TS23: parietal bone	Absent		1I	No expression in mesenchymal condensations of osteogenic fronts of parietal bone.
TS23: head mesenchyme	Strong	Regionally restricted	1I	Strong expression in sutural mesenchyme.
TS23: perichondrium	Present		1I	Expression limited to perichondrium.

Structure	Level	Pattern	Image	Note
TS23: mandible	Strong	Regionally restricted	1M	Strong expression in osteoblasts of mandible.
TS23: Meckel's cartilage	Strong	Regionally restricted	1M	Strong expression in perichondrium of Meckel's cartilage.