Probe:	Pea3 probe
Probe preparation:	Antisense labelled with S35 RNA

Structure	Level	Pattern	Image	Note
TS23: dental papilla	Strong		5C
TS23: dorsal root ganglion	Strong		5C
TS23: jaw	Present		5C
TS23: tongue	Present		5C
TS23: trachea cartilaginous ring	Present		5C
TS23: skeletal muscle	Present	Regionally restricted	5C	Expression in neck muscles.
TS23: appendicular skeleton	Present	Regionally restricted	5C	Expression in young aggregating chondroblasts but not in cartilage matrix.
TS23: salivary gland	Strong	Regionally restricted	5C	High expression in bulbous epithelial lobules, composed of epithelial cells surrounded by condensed mesenchymal cells. No expression in the more differentiated epithelial stalks.

Structure	Level	Pattern	Image	Note
TS17: lens pit	Weak		6D	Expression in both the neural layer of the retina and in the lens.
TS17: optic cup	Weak		6D	Expression in both the neural layer of the retina and in the lens.

Structure	Level	Pattern	Image	Note
TS23: retina nuclear layer	Weak		7D
TS23: optic choroid	Present		7D

Structure	Level	Pattern	Image	Note
TS23: olfactory epithelium	Present	Regionally restricted	8D	Expression in both the neural layer of the retina and in the lens.
TS23: nose	Present	Regionally restricted	8D	Homogenous expression in mesenchyme adjacent to the olfactory vesicle.
TS23: nasal capsule	Present	Regionally restricted	8D	Expression in perichondrial cells lining newly formed cartilage of nasal capsule and septum.
TS23: nasal septum	Present	Regionally restricted	8D	Expression in perichondrial cells lining newly formed cartilage of nasal capsule and septum.

Structure	Level	Pattern	Image	Note
TS23: adenohypophysis	Present		9D
TS23: neurohypophysis infundibulum	Present		9D

Structure	Level	Pattern	Image	Note
TS23: mammary gland primordium epithelium	Strong		10C
TS23: skeletal muscle	Present	Regionally restricted	10C	Expression in perichondrial cells lining newly formed cartilage of nasal capsule and septum.
TS23: appendicular skeleton	Present	Regionally restricted	10C	Expression in young aggregating chondroblasts but not in cartilage matrix
TS23: atrium cardiac muscle	Weak		10C
TS23: lung epithelium	Weak		10C
TS23: lung mesenchyme	Weak		10C
TS23: ventricle cardiac muscle	Weak		10C

Structure	Level	Pattern	Image	Note
TS17: neural tube floor plate	Present		11C
TS17: dermomyotome	Present	Regionally restricted	11C	Expression in the lateral dermomyotome and adjacent sclerotomal cells.
TS17: sclerotome	Present	Regionally restricted	11C	Expression in the lateral dermomyotome and adjacent sclerotomal cells.

Structure	Level	Pattern	Image	Note
TS23: gut mesenchyme	Present	Regionally restricted	12D	Expression in differentiating mesodermal layers surrounding the tracheal and digestive tract.
TS23: gut epithelium	Present	Regionally restricted	12D	Expression in the basal layers of endodermal epithelium.

Structure	Level	Pattern	Image	Note
TS19: limb mesenchyme	Strong	Regionally restricted	13D	Expression in distal mesenchymal cells correponding to the progress zone.
TS19: apical ectodermal ridge	Strong		13D

Structure	Level	Pattern	Image	Note
TS23: ureteral mesenchyme	Present	Regionally restricted	14C	Expression in the ureteric epithelium and surrounding mesenchymal condensation.
TS23: urothelium of ureter	Present	Regionally restricted	14C	Expression in the ureteric epithelium and surrounding mesenchymal condensation.

Structure	Level	Pattern	Image	Note
TS21: thymus primordium	Present	Regionally restricted	15D	Expression in epithelial cells of the capsule located in the periphery of the gland.

Structure	Level	Pattern	Image	Note
TS17: lung epithelium	Present

Structure	Level	Pattern	Image	Note
TS21: tooth epithelium	Present
TS21: tooth mesenchyme	Present
TS21: neural retinal epithelium	Weak

Structure	Level	Pattern	Image	Note
TS23: thyroid gland	Present	Regionally restricted		Expression in the epithelial cells of the peripheral capsule.