Probe:	Myog cDNA16
Probe preparation:	Antisense labelled with S35 RNA
Visualized with:	Autoradiography

Structure	Level	Pattern	Image	Note
TS15: myotome	Present	Regionally restricted	1C	Expressed in the myotomal part of the first 15-18 somites, and in the next one to two more posterior (less mature) somites. No expression in most caudal somites.

Structure	Level	Pattern	Image	Note
TS15: myotome	Present	Regionally restricted	1F	Expressed in the myotomal part of the first 15-18 somites, and in the next one to two more posterior (less mature) somites. No expression in most caudal somites.

Structure	Level	Pattern	Image	Note
TS17: head mesenchyme	Present	Regionally restricted	3D	Expressed in extramyotomal premuscle cell masses in the cervical region, including the laryngeal premuscle cell mass and the posterior part of the hypoglossal cord.
TS17: myotome	Present	Regionally restricted	3D	Expressed in the myotomal part of most somites, both rostral and caudal.

Structure	Level	Pattern	Image	Note
TS17: 1st branchial arch mandibular component mesenchyme	Present	Regionally restricted	4D	Expressed in extramyotomal premuscle cell masses in the dorsolateral part of the 1st arch.

Structure	Level	Pattern	Image	Note
TS17: 2nd branchial arch mesenchyme	Present	Regionally restricted	5B	Transcripts in premuscle cell masses in the pharyngeal region, including the dorsolateral part of the 2nd visceral arch, hypoglossal cords, and laryngeal muscle anlage.
TS17: head mesenchyme	Present	Regionally restricted	5B	Transcripts in premuscle cell masses in the pharyngeal region, including the dorsolateral part of the 2nd visceral arch, hypoglossal cords, and laryngeal muscle anlage.

Structure	Level	Pattern	Image	Note
TS19: trunk myotome	Strong	Regionally restricted	6C	Strong hybridization in diaphragmal premuscle masses at the level of the forelimb buds.

Structure	Level	Pattern	Image	Note
TS19: trunk myotome	Strong	Regionally restricted	7B	Strong hybridization in mytomes above the limb buds.
TS19: hindlimb bud mesenchyme	Present	Regionally restricted	7B	Expressed in ventral and dorsal premuscle cell masses in posterior regions of the limb bud.

Structure	Level	Pattern	Image	Note
TS19: trunk myotome	Strong	Regionally restricted	7F	Strong hybridization in mytomes above the limb buds.
TS19: hindlimb bud mesenchyme	Present	Regionally restricted	7F	Expressed in few cells in the dorsal premuscle cell masses in anterior regions of the limb bud.

Structure	Level	Pattern	Image	Note
TS20: head mesenchyme	Present	Regionally restricted	8B , 8F	In the most superficial muscle (platysma) anlage in the pharyngeal region, only expressed in few cells.

Structure	Level	Pattern	Image	Note
TS14: somite	Present	Regionally restricted		Expressed in rostral somites.

Structure	Level	Pattern	Image	Note
TS15: cardiac muscle tissue	Absent

Structure	Level	Pattern	Image	Note
TS19: perioptic mesenchyme	Present	Regionally restricted		Expressed in the extraocular muscle rudiments.
TS19: forelimb bud mesenchyme	Present
TS19: 1st branchial arch	Present	Regionally restricted		Expressed in muscle-forming regions delineated in previous stages, including parts of the 1st and 2nd branchial arches, hypoglossal cords, and laryngeal muscle anlage.
TS19: 2nd branchial arch mesenchyme	Present	Regionally restricted		Expressed in muscle-forming regions delineated in previous stages, including parts of the 1st and 2nd branchial arches, hypoglossal cords, and laryngeal muscle anlage.
TS19: head mesenchyme	Present	Regionally restricted		Expressed in muscle-forming regions delineated in previous stages, including parts of the 1st and 2nd branchial arches, hypoglossal cords, and laryngeal muscle anlage.

Structure	Level	Pattern	Image	Note
TS20: forelimb mesenchyme	Present
TS20: head mesenchyme	Present
TS20: hindlimb mesenchyme	Present
TS20: myotome	Present