Probe:	Id3 cDNA4
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS7: ectoderm	Present		1_E5.5 right
TS7: extraembryonic endoderm	Present		1_E5.5 right
TS7: extraembryonic ectoderm	Absent		1_E5.5 right

Structure	Level	Pattern	Image	Note
TS9: embryo ectoderm	Present		1_E6.5 upper right	Same as that observed at E5.5.
TS9: extraembryonic endoderm	Present		1_E6.5 upper right	Same as that observed at E5.5.
TS9: extraembryonic ectoderm	Absent		1_E6.5 upper right

Structure	Level	Pattern	Image	Note
TS11: embryo	Present	Widespread	2E/F
TS11: yolk sac endoderm	Present	Regionally restricted	2E/F	Expressed in the visceral yolk sac.

Structure	Level	Pattern	Image	Note
TS19: neural tube floor plate	Present		3M
TS19: neural tube roof plate	Present		3M
TS19: neural tube ventricular layer	Present	Regionally restricted	3M	Expressed the ventral portion.

Structure	Level	Pattern	Image	Note
TS19: midbrain floor plate	Present		3N
TS19: midbrain roof plate	Present		3N
TS19: diencephalon lateral wall ventricular layer	Present	Regionally restricted	3N	Broader and more intense along the ventricular zone in the third ventricle.
TS19: telencephalon	Present	Regionally restricted	3N	Expressed in the medial side of the telencephalic vesicles, located laterally to the third ventricle.

Structure	Level	Pattern	Image	Note
TS19: hindbrain	Present		3O

Structure	Level	Pattern	Image	Note
TS19: myelencephalon	Present		3P

Structure	Level	Pattern	Image	Note
TS20: diencephalon	Present		4D
TS20: midbrain	Present		4D
TS20: telencephalon	Present	Regionally restricted	4D	Expressed in the medial side of the telencephalic vesicles, located laterally to the third ventricle.

Structure	Level	Pattern	Image	Note
TS22: midbrain ventricular layer	Present		4I

Structure	Level	Pattern	Image	Note
TS22: choroid plexus	Present		4N
TS22: telencephalon ventricular layer	Present		4N

Structure	Level	Pattern	Image	Note
TS19: otocyst	Present		6H	Expressed in both the epithelium of the otic vesicle and its surrounding mesenchyme.
TS19: otocyst epithelium	Present		6H

Structure	Level	Pattern	Image	Note
TS22: neural retinal epithelium	Present		7D
TS22: pigmented retinal epithelium	Absent		7D
TS22: lens	Present	Scattered	7D

Structure	Level	Pattern	Image	Note
TS19: nasal pit epithelium	Present	Non-Uniform	7I
TS19: nasal process	Present	Regionally restricted	7I	Expressed in the area surrounding the nasal placode.

Structure	Level	Pattern	Image	Note
TS22: olfactory epithelium	Weak	Regionally restricted	7N	Expressed in the presumptive olfactory neuronal progenitors located next to the mesenchyme.
TS22: nasal mesenchyme	Weak	Regionally restricted	7N	Expressed in the supporting cell layer, which is located adjacent to the lumen of the nasal cavity.

Structure	Level	Pattern	Image	Note
TS6: embryo	Absent
TS6: extraembryonic component	Absent

Structure	Level	Pattern	Image	Note
TS13: neural fold	Present
TS13: neural tube floor plate	Present

Structure	Level	Pattern	Image	Note
TS15: neural tube	Present
TS15: optic vesicle	Present

Structure	Level	Pattern	Image	Note
TS17: optic cup inner layer	Present
TS17: trigeminal ganglion	Present
TS17: lens vesicle	Present	Scattered
TS17: optic cup outer layer	Absent
TS17: olfactory placode	Present			Expression is not uniform throughout the placodal epithelium.
TS17: nasal process	Present	Regionally restricted		Expressed in the area surrounding the nasal placode.

Structure	Level	Pattern	Image	Note
TS19: Rathke's pouch	Present
TS19: infundibular recess of 3rd ventricle	Present

Structure	Level	Pattern	Image	Note
TS20: neural retinal epithelium	Present
TS20: lens vesicle	Present	Scattered
TS20: pigmented retinal epithelium	Absent

Structure	Level	Pattern	Image	Note
TS24: lens	Present	Scattered
TS24: neural retina	Present
TS24: pigmented retinal epithelium	Absent

Structure	Level	Pattern	Image	Note
TS28: decidua	Present	Regionally restricted		Expressed in the fibroblastic stromal cells prior to their decidulation.