Probe:	Etl4 cDNA2
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS15: embryo	Present		1Fa

Structure	Level	Pattern	Image	Note
TS13: notochord	Present	Uniform	2a	Expression was detected in the notochord along its entire length.

Structure	Level	Pattern	Image	Note
TS13: notochord	Present	Uniform	2b	Expression was detected in the notochord along its entire length.

Structure	Level	Pattern	Image	Note
TS14: notochord	Present	Graded	2c	Expression the notochord appeared graded with high expression in the caudal region.
TS14: branchial arch	Present		2c
TS14: otic placode	Present		2c

Structure	Level	Pattern	Image	Note
TS15: notochord	Present	Graded	2d	Expression the notochord appeared graded with high expression in the caudal region.

Structure	Level	Pattern	Image	Note
TS16: notochord	Present	Graded	2e	Expression the notochord appeared graded with high expression in the caudal region.
TS16: forelimb bud apical ectodermal ridge	Present		2e
TS16: apical ectodermal ridge	Present		2e	Expression was detected in the apical ectodermal ridge of the fore- and hindlimbs.

Structure	Level	Pattern	Image	Note
TS17: notochord	Present	Graded	2f	Expression the notochord appeared graded with high expression in the caudal region.
TS17: forelimb bud apical ectodermal ridge	Present		2f
TS17: hindlimb bud apical ectodermal ridge	Present		2f

Structure	Level	Pattern	Image	Note
TS19: notochord	Present	Graded	2g	Expression the notochord appeared graded with high expression in the caudal region.

Structure	Level	Pattern	Image	Note
TS23: nucleus pulposus	Present		2i	Expression persisted in the developing nucleus pulposus throughout the whole vertebral column.

Structure	Level	Pattern	Image	Note
TS23: annulus fibrosus	Present		2j	Expression persisted in the developing annulus fibrosus throughout the whole vertebral column.

Structure	Level	Pattern	Image	Note
TS23: renal cortex	Strong	Regionally restricted	3a	Strong signals in the cortical region presumably in developing nephrons.
TS23: nephron	Strong		3a
TS23: urothelium of ureter	Present		3a

Structure	Level	Pattern	Image	Note
TS23: renal cortex	Strong	Regionally restricted	3b	Strong signals in the cortical region presumably in developing nephrons.
TS23: nephron	Strong		3b
TS23: nephric duct	Present		3b
TS23: testis cortical region	Strong		3b
TS23: seminiferous cord	Present	Regionally restricted	3b	Expression was detected in the outer region of the seminiferous tubules.

Structure	Level	Pattern	Image	Note
TS23: bladder	Present		3c

Structure	Level	Pattern	Image	Note
TS23: lung epithelium	Present		3d

Structure	Level	Pattern	Image	Note
TS23: bronchus	Present		3e
TS23: lung epithelium	Present		3e

Structure	Level	Pattern	Image	Note
TS23: cochlea epithelium	Present		3f
TS23: middle ear epithelium	Present		3f	Expression was detected in the tympanic cavity epithelium.

Structure	Level	Pattern	Image	Note
TS23: nasopharynx	Present		3g

Structure	Level	Pattern	Image	Note
TS23: lens	Present		3h
TS23: optic nerve	Present		3h
TS23: retina	Present	Regionally restricted	3h	Expression was detected in the inner layer of the retina.

Structure	Level	Pattern	Image	Note
TS23: submandibular gland	Present		3i

Structure	Level	Pattern	Image	Note
TS23: vibrissa follicle	Present	Regionally restricted	3j	Expression was detected in primordia of vibrissa follicles associated with the upper lip.

Structure	Level	Pattern	Image	Note
TS23: thymus primordium	Present		3k
TS23: thyroid gland	Present		3k

Structure	Level	Pattern	Image	Note
TS23: pancreatic acinus	Present	Regionally restricted	3l	Expression was detected in the pancreatic primordium, most likely within the exocrine acini.
TS23: gut epithelium	Present		3l
TS23: gut	Present	Regionally restricted	3l	Expression was detected in the wall and epithelium of the gut.