Probe:	Tbx15 cDNA4
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS15: forelimb bud	Present		1A

Structure	Level	Pattern	Image	Note
TS17: forelimb bud	Present	Regionally restricted	1B , 1B inset	Expression is along the proximo-distal extension in the central region and is absent in the anterior and posterior edges.
TS17: head	Present	Regionally restricted	1B	There is an expression domain above the eye.
TS17: hindlimb bud	Present		1B

Structure	Level	Pattern	Image	Note
TS19: forelimb bud	Present	Regionally restricted	1C	Expression is along the proximo-distal extension in the central region and is absent in the anterior and posterior edges.
TS19: head	Present	Regionally restricted	1C	There is an expression domain above the eye.
TS19: hindlimb bud	Present		1C

Structure	Level	Pattern	Image	Note
TS20: forelimb	Present	Regionally restricted	1D	Expression is along the proximo-distal extension in the central region and is absent in the anterior and posterior edges.
TS20: hindlimb	Present		1D

Structure	Level	Pattern	Image	Note
TS17: head mesenchyme	Present	Regionally restricted	1E	Expression is in the unsegmented cranial mesenchyme.

Structure	Level	Pattern	Image	Note
TS17: forelimb bud mesenchyme	Strong	Regionally restricted	1F	Expression is highest in the central core of the forelimb bud.

Structure	Level	Pattern	Image	Note
TS19: head mesenchyme	Present	Regionally restricted	1G	Expression is in the unsegmented cranial mesenchyme.

Structure	Level	Pattern	Image	Note
TS19: forelimb bud mesenchyme	Present	Regionally restricted	1H	Expression is weak in the condensing cells and strong in the surrounding mesenchyme.

Structure	Level	Pattern	Image	Note
TS20: forelimb mesenchyme	Present	Regionally restricted	1I , 1K	Expression is weak in the condensing cells and strong in the surrounding mesenchyme.
TS20: chondrocranium	Present	Regionally restricted	1I , 1J	Expression is downregulated upon condensation of mesenchymal cells into the primordia of the skeletal elements of the basioccipital bone.
TS20: vertebral cartilage condensation	Present	Regionally restricted	1I	Expression is in mesenchymal cells surrounding the condensations of the vertebral bodies.

Structure	Level	Pattern	Image	Note
TS22: hindlimb mesenchyme	Present	Regionally restricted	1O , 1L	Expression is weak in the condensing cells and strong in the surrounding mesenchyme.
TS22: hindlimb	Present	Regionally restricted	1O , 1L	Expression is high in the developing joints, the articular mesenchyme, and the perichondrium.
TS22: basioccipital cartilage condensation	Present	Regionally restricted	1M , 1L	Expression is maintained in mesenchymal cells surrounding the condensations, whereas resting and proliferating chondrocytes show lower expression.
TS22: vertebral cartilage condensation	Present	Regionally restricted	1L	Expression is in mesenchymal cells surrounding the condensations of the vertebral bodies.
TS22: skeletal muscle	Present		1L

Structure	Level	Pattern	Image	Note
TS23: hand mesenchyme	Strong	Regionally restricted	1P	Expression is high in the developing joints, the articular mesenchyme, and the perichondrium.
TS23: forelimb digit 2	Present		1P
TS23: forelimb digit 3	Present		1P
TS23: forelimb digit 4	Present		1P
TS23: forelimb digit 1	Absent		1P
TS23: forelimb digit 5	Absent		1P

Structure	Level	Pattern	Image	Note
TS23: humerus	Present	Regionally restricted	1Q	Expression is in the resting chondrocytes of the proximal region of the humerus.
TS23: skeletal muscle	Present		1Q

Structure	Level	Pattern	Image	Note
TS24: humerus	Present	Regionally restricted	1R	Expression is in the resting chondrocytes of the proximal region of the humerus.
TS24: skeletal muscle	Present		1R

Structure	Level	Pattern	Image	Note
TS26: skeletal muscle	Present		1S
TS26: humerus	Absent		1S