Probe:	Ybx1 cDNA1
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS19: limb mesenchyme	Strong			Expression is present in the muscle-forming region.

Structure	Level	Pattern	Image	Note
TS15: limb mesenchyme	Moderate			There is moderate staining in the distal and proximal limb.
TS15: limb	Moderate			There is moderate staining in the anterior and posterior limb.
TS15: trunk somite	Strong
TS15: 1st branchial arch maxillary component	Moderate			Staining is present in the maxillary process.
TS15: 1st branchial arch	Moderate			Staining is present in the mandibular arch.
TS15: 2nd branchial arch	Moderate			Staining is present in the hyoid arch.
TS15: eye	Moderate

Structure	Level	Pattern	Image	Note
TS17: limb mesenchyme	Strong	Non-Uniform		Staining is strong in the progress zone and moderate in the middle limb.
TS17: limb	Moderate	Regionally restricted		Staining is present in the posterior limb.
TS17: trunk somite	Strong
TS17: tail	Moderate
TS17: 1st branchial arch maxillary component	Strong			Staining is present in the maxillary process.
TS17: 1st branchial arch	Strong			Staining is present in the mandibular arch.
TS17: 2nd branchial arch	Strong			Staining is present in the hyoid arch.
TS17: eye	Moderate
TS17: genitourinary system	Strong	Regionally restricted		Staining is present in the external genitalia.

Structure	Level	Pattern	Image	Note
TS19: limb mesenchyme	Strong	Non-Uniform		Staining is strong in the progress zone and muscle and moderate in the middle and proximal limb.
TS19: limb	Strong	Regionally restricted		Staining is present in the antero-distal and posterior-distal regions of the limb.
TS19: trunk somite	Strong
TS19: maxillary process	Strong			Staining is present in the maxillary process.
TS19: eye	Moderate
TS19: telencephalon	Moderate
TS19: midbrain	Moderate
TS19: hindbrain	Moderate			Staining is present in the metencephalon.