Probe:	Sna probe1
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS10: embryo mesoderm	Strong		4B
TS10: parietal endoderm	Strong		4B
TS10: primitive streak	Strong		4B

Structure	Level	Pattern	Image	Note
TS10: embryo mesoderm	Strong		4C
TS10: parietal endoderm	Strong		4C
TS10: primitive streak	Strong		4C

Structure	Level	Pattern	Image	Note
TS12: head mesenchyme	Strong		5B
TS12: trunk unsegmented mesenchyme	Strong		5B
TS12: neural ectoderm	Absent		5B	No expression in neuroepithelium.

Structure	Level	Pattern	Image	Note
TS12: trunk unsegmented mesenchyme	Present		5C

Structure	Level	Pattern	Image	Note
TS13: trunk unsegmented mesenchyme	Strong		5E
TS13: neural ectoderm	Absent		5E

Structure	Level	Pattern	Image	Note
TS12: head mesenchyme	Present		6A , 6C	Transcripts in all cephalic mesenchyme.
TS12: head mesenchyme derived from neural crest	Present	Regionally restricted	6C , 6A	Expression in neural crest cells delaminating from the lateral edge of the hindbrain epithelium.

Structure	Level	Pattern	Image	Note
TS15: forelimb bud mesenchyme	Very strong		7B
TS15: forelimb bud ectoderm	Absent		7B	No expression in the apical ectodermal ridge.
TS15: trunk paraxial mesenchyme	Present		7B
TS15: trunk mesenchyme	Present	Regionally restricted	7B	Expression in lateral mesoderm.
TS15: future spinal cord	Absent		7B
TS15: gut	Absent		7B	No expression in gut endoderm.

Structure	Level	Pattern	Image	Note
TS15: embryo mesenchyme	Present		7C	Authors report expression in most mesenchymal cells, whether of neural crest or mesodermal origin.
TS15: central nervous system	Absent		7C	Entirely absent from neuroepithelium.

Structure	Level	Pattern	Image	Note
TS15: trunk sclerotome	Strong		7D	In somites, highest levels of expression in the sclerotome.
TS15: trunk dermomyotome	Present	Regionally restricted	7D	Lower levels in the myotome; largely absent from the dermatome.

Structure	Level	Pattern	Image	Note
TS17: embryo	Present	Regionally restricted	7E	Authors report that expression is similar to that observed at 9.5 dpc.
TS17: embryo mesenchyme	Strong		7E	High levels in majority of mesenchymal cells, of neural crest or of mesodermal origin.
TS17: dorsal root ganglion	Absent		7E	No expression in neuronal derivatives of both cranial and trunk neural crest, such as trigeminal and dorsal root ganglia.
TS17: trigeminal ganglion	Absent		7E	No expression in neuronal derivatives of both cranial and trunk neural crest, such as trigeminal and dorsal root ganglia.
TS17: brain	Absent		7E	No expression in neuroepithelium of the brain or spinal cord.
TS17: future spinal cord	Absent		7E	No expression in neuroepithelium of the brain or spinal cord.

Structure	Level	Pattern	Image	Note
TS17: lung	Strong	Regionally restricted	7F	High levels of expression in mesenchyme surrounding the epithelial layer of a developing lung bud.

Structure	Level	Pattern	Image	Note
TS21: embryo	Present	Regionally restricted		Authors report diminished overall level of expression.

Structure	Level	Pattern	Image	Note
TS21: nose	Strong	Regionally restricted	8A	High levels of expression in condensing nasal cartilage.
TS21: mandible mesenchyme	Strong	Regionally restricted	8A	High levels of expression in condensing mandibular cartilage.
TS21: lateral ventricle choroid plexus	Present		8A

Structure	Level	Pattern	Image	Note
TS21: lateral ventricle choroid plexus	Present	Regionally restricted	8B	Authors report expression in the mesenchymal layer of the choroid plexus.
TS21: head mesenchyme	Present	Regionally restricted	8B	High levels of expression in mesenchyme migrating into the involuting choroid plexus neuroepithelium.

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar mesenchyme	Strong	Regionally restricted	8C	Intense expression in condensing mesenchyme beneath the first molar tooth bud.
TS21: upper jaw molar mesenchyme	Strong	Regionally restricted	8C	Intense expression in condensing mesenchyme beneath the first molar tooth bud.

Structure	Level	Pattern	Image	Note
TS21: metanephros	Present	Regionally restricted	8D	Expression in metanephric mesenchyme, but not in glomerular epithelium.

Structure	Level	Pattern	Image	Note
TS21: lung	Present	Regionally restricted	8E	Expression in lung mesenchyme, but not in bronchial epithelium.
TS21: axial skeleton	Present	Regionally restricted	8E	Expression in condensing cartilage of the prevertebra.
TS21: spinal ganglion	Absent		8E

Structure	Level	Pattern	Image	Note
TS24: head mesenchyme	Strong	Regionally restricted	8F	High levels of expression in mesenchyme in the snout.
TS24: vibrissa dermal component	Very strong	Regionally restricted	8F	Strongest in mesenchyme condensing around vibrissa follicles.

Structure	Level	Pattern	Image	Note
TS24: foot mesenchyme	Present	Regionally restricted	8G	Expression in cartilage of the hindfoot plate.