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Table 1.

Summary of SOX9 sites of expression in the developing chick GI tract

	Five days old			Nine days old
GI level	Mesoderm	Endoderm	Mesoderm	Endoderm
Esophagus	−	+++	−	+++
Stomach	−	−	−	−
Pyloric sphincter	+++	−	+++	−
Midgut	−	+	−	+++
Caeca	+++	++	+	+++
Hindgut	−	+++	−	++

	Five days old			Nine days old
GI level	Mesoderm	Endoderm	Mesoderm	Endoderm
Esophagus	−	+++	−	+++
Stomach	−	−	−	−
Pyloric sphincter	+++	−	+++	−
Midgut	−	+	−	+++
Caeca	+++	++	+	+++
Hindgut	−	+++	−	++

−, no detection; +, weak expression; ++, moderate expression; +++,strong expression.