Probe:	p-alpha-2R2 cDNA
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS22: mandible	Present	Regionally restricted	1a , 1c	Expression was detected in cells adjacent to the posterior edge of the ossifying mandible. Expression was also noted posteriorly in the mesenchymal cell aggregation.

Structure	Level	Pattern	Image	Note
TS23: mandible	Present	Regionally restricted	2b	Expression was high in periosteal osteogenic cells. High expression was detected in hypertrophic chondrocytes of the cartilage matrix.

Structure	Level	Pattern	Image	Note
TS24: mandible	Present	Regionally restricted	3b	Expression was detected in the periosteal osteogenic cells surrounding the cartilaginous tissue. Slight expression was noted in the fibrous cell layer to the upper hypertrophic layer but is hardly detectable in the lower half of the hypertrophic layer.

Structure	Level	Pattern	Image	Note
TS26: mandible	Weak	Regionally restricted	5b	The expression level in the condylar cartilage decreased, but it's localization was almost the same as at E16.0.

Structure	Level	Pattern	Image	Note
TS21: tibia-fibula pre-cartilage condensation	Present	Regionally restricted	6b	Expression was detected in the chondrocytes and in the osteogenic cells surrounding the cartilaginous tissue.

Structure	Level	Pattern	Image	Note
TS22: tibia cartilage condensation	Present	Regionally restricted	6g	Expression was detected in the chondrocytes at the epiphysis, gradually decreased toward the depths, and was not detected in the hypertrophic chondrocytes of the diaphysis.