Reporter:	lacZ
	Direct Detection

Structure	Level	Pattern	Image	Note
TS16: somite	Present	Regionally restricted	2a left	Positive myotomal cells accumulate under the dermomyotome.
TS16: myotome	Present		2a left

Structure	Level	Pattern	Image	Note
TS16: somite	Present	Non-Uniform	2a right	In rostral somites where the segmental organization of muscle cells was lost, and at thoracic levels where a ventral accumulation was also observed

Structure	Level	Pattern	Image	Note
TS16: somite	Present	Regionally restricted	2b	Positive myotomal cells accumulate under the dermomyotome.
TS16: myotome	Present		2b

Structure	Level	Pattern	Image	Note
TS16: somite	Present	Regionally restricted	2c	Like those in the wild-type, positive muscle progenitors delaminated from the dermomyotome to become mesenchymal, but migrated aberrantly. Some ventrally in the sclerotome, whereas other cells became positioned dorsally, adjacent to the ectoderm, in regions that do not normally contain myogenic cells.

Structure	Level	Pattern	Image	Note
TS18: myotome	Present		4a

Structure	Level	Pattern	Image	Note
TS18: somite	Present		4b	Most dramatic disorganization of positive progenitors in the rostral somites.

Structure	Level	Pattern	Image	Note
TS18: myotome	Present		4c

Structure	Level	Pattern	Image	Note
TS16: somite	Present	Regionally restricted	4d , 4e	Like those in the wild-type, positive muscle progenitors delaminated from the dermomyotome to become mesenchymal, but migrated aberrantly. Some ventrally in the sclerotome, whereas other cells became positioned dorsally, adjacent to the ectoderm, in regions that do not normally contain myogenic cells.

Structure	Level	Pattern	Image	Note
TS20: myotome	Present	Regionally restricted	5a	Expressed in the intercostal muscles, distinct from the Scx hybridization signal.

Structure	Level	Pattern	Image	Note
TS20: somite	Present		5c , 5b	Positive cells were dispersed among the condensing cells of the ribs. Many of them expressed Scx.

Structure	Level	Pattern	Image	Note
TS24: rib	Absent		6a
TS24: intercostal muscle	Present		6a

Structure	Level	Pattern	Image	Note
TS24: rib	Present	Regionally restricted	6b	Expressed in the central part of the rib anlagen.
TS24: intercostal muscle	Present		6b	The muscles in this region were perturbed.

Structure	Level	Pattern	Image	Note
TS20: somite	Present	Regionally restricted		At caudal levels, positive cells migrated aberrantly. Some ventrally in the sclerotome, whereas other cells became positioned dorsally, adjacent to the ectoderm, in regions that do not normally contain myogenic cells.