Probe:	ihh probe13
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS20: humerus pre-cartilage condensation	Present		1A ihh

Structure	Level	Pattern	Image	Note
TS21: humerus cartilage condensation	Present		1B ihh/gli1	Expression restricted to chondrocytes in humerus, radius and ulna, and in mesenchymal cells of digits.
TS21: radius-ulna cartilage condensation	Present		1B ihh/gli1	Expression restricted to chondrocytes in humerus, radius and ulna, and in mesenchymal cells of digits.
TS21: forelimb digit mesenchyme	Present		1B ihh/gli1	Expression restricted to chondrocytes in humerus, radius and ulna, and in mesenchymal cells of digits.

Structure	Level	Pattern	Image	Note
TS22: forelimb cartilage condensation	Present	Regionally restricted	1C ihh	Expression restricted to mature and early hypertrophic chondrocytes.

Structure	Level	Pattern	Image	Note
TS26: forelimb skeleton	Strong	Regionally restricted	2A ihh	Expression restricted to mature and early hypertrophic chondrocytes.

Structure	Level	Pattern	Image	Note
TS28: tibia	Weak	Regionally restricted	2D ihh	Very low levels of expression detected in secondary ossification center.
TS28: long bone epiphyseal plate hypertrophic zone	Present	Regionally restricted	2D ihh	Expression restricted to mature and early hypertrophic chondrocytes of the growth plate.