The Company of Biologists

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.