Reporter:	lacZ
	Direct Detection

Structure	Level	Pattern	Image	Note
TS15: 1st branchial arch	Present		2A
TS15: 2nd branchial arch	Present		2A
TS15: head mesenchyme	Present		2A
TS15: tail unsegmented mesenchyme	Present		2A
TS15: sclerotome	Present	Regionally restricted	2A	As somites differentiate the expression decreases and becomes restricted to the sclerotome.
TS15: somite	Present	Regionally restricted	2A	As somites differentiate the expression decreases and becomes restricted to the sclerotome.

Structure	Level	Pattern	Image	Note
TS15: tail unsegmented mesenchyme	Strong		2B	Expression is strongest in somitomere 2.
TS15: sclerotome	Present	Regionally restricted	2B	As somites differentiate the expression decreases and becomes restricted to the sclerotome.
TS15: somite	Present	Regionally restricted	2B	As somites differentiate the expression decreases and becomes restricted to the sclerotome.

Structure	Level	Pattern	Image	Note
TS17: head mesenchyme	Present		2C	Expression includes the mesenchyme around the nasal epithelium and eye.
TS17: branchial arch	Present		2C
TS17: forelimb bud mesenchyme	Present		2C
TS17: heart	Present		2C
TS17: axial skeleton	Present		2C	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS17: skeleton	Present		2C	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS17: vertebral cartilage condensation	Present		2C	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.

Structure	Level	Pattern	Image	Note
TS20: axial skeleton	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: forelimb mesenchyme	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: hindlimb mesenchyme	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: rib pre-cartilage condensation	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: skeleton	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: vertebral cartilage condensation	Present		2D	Expression is in the condensing prechondrogenic mesenchyme of the future axial and appendicular skeleton, including the vertebrae, limbs, ribs, and sternum.
TS20: head mesenchyme	Strong	Regionally restricted	2D	Expression is in the mesenchyme of the branchial arches, around the nasal epithelium and eye.

Structure	Level	Pattern	Image	Note
TS19: blood vessel	Present		2E , 2F	Expression is in the head mesenchyme, including the developing meninges and blood vessels, and blood vessels in the neuroepithelium.
TS19: head mesenchyme	Present		2E , 2F	Expression is in the head mesenchyme, including the developing meninges and blood vessels, and blood vessels in the neuroepithelium.
TS19: endocardial lining	Present		2E , 2G
TS19: mesonephric tubule	Strong		2H , 2E
TS19: mesonephros mesenchyme	Strong		2H , 2E
TS19: somite	Present	Regionally restricted	2I , 2E	Expression is in early epithelial somites.
TS19: sclerotome	Present		2E , 2I
TS19: tail unsegmented mesenchyme	Present		2E , 2I

Structure	Level	Pattern	Image	Note
TS20: hindlimb mesenchyme	Very strong		2J

Structure	Level	Pattern	Image	Note
TS20: skeleton	Present	Regionally restricted	2K	Expression is in the condensing mesenchyme of the sternum primordium.
TS20: rib pre-cartilage condensation	Present	Regionally restricted	2K	Expression is in the perichondrium of the ribs and is down-regulated in the undifferentiated chondrocytes.

Structure	Level	Pattern	Image	Note
TS20: eye	Present	Regionally restricted	4A	Expression is in periocular mesenchyme and in the ectoderm of the future inner eyelids.
TS20: cornea	Present	Single cells	4A
TS20: hyaloid vascular plexus	Present	Regionally restricted	4A	Expression is in endothelial cells.

Structure	Level	Pattern	Image	Note
TS21: hindbrain meninges	Present	Regionally restricted	7A	Expression is in arachnoid cells.
TS21: head mesenchyme	Present	Regionally restricted	7A	Expression is in mesenchyme overlying the meninges' arachnoid cells.

Structure	Level	Pattern	Image	Note
TS21: hindbrain meninges	Present	Regionally restricted	7B	There are fewer expressing cells in this mutant.
TS21: skin	Absent		7B