Reporter:	lacZ
	Direct Detection

Structure	Level	Pattern	Image	Note
TS11: embryo mesenchyme	Present	Widespread	1A	Staining is observed in most of the mesoderm of the embryonic region.
TS11: embryo ectoderm	Absent		1A
TS11: embryo endoderm	Absent		1A
TS11: primitive streak	Absent		1A

Structure	Level	Pattern	Image	Note
TS12: embryo mesenchyme	Present	Regionally restricted	1B	Staining is absent from midline structures like the axial mesoderm.
TS12: lateral plate mesoderm	Present	Regionally restricted	1B	Staining is observed in the anterior region of the lateral plate mesoderm, but is absent in the prospective floorplate.
TS12: paraxial mesenchyme	Present		1B

Structure	Level	Pattern	Image	Note
TS12: embryo	Present	Non-Uniform	1C	Staining pattern differs between the anterior and posterior regions ofthe embryo.
TS12: lateral plate mesoderm	Present	Regionally restricted	1C	Staining observed in anterior region of LPM is complete. Posterior to the node, staining is observed only in the most lateral regions.
TS12: paraxial mesenchyme	Present		1C	Staining observed in anterior region of the paraxial mesoderm is complete.
TS12: embryo endoderm	Present		1C	Staining observed in anterior region of the definitive endoderm is complete.
TS12: heart	Present		1C

Structure	Level	Pattern	Image	Note
TS12: yolk sac	Present			Staining is observed in about 30-50% of extra-embryonic mesoderm cells.
TS12: amnion	Present			Staining is observed in about 30-50% of extra-embryonic mesoderm cells.

Structure	Level	Pattern	Image	Note
TS15: embryo	Present	Regionally restricted	1C	Staining is observed in mesoderm-derived cells in the anterior region, but mesoderm is posterior region is negative.