Antibody:	anti-Phox2b
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS17: enteric nervous system	Present	Scattered	3A
TS17: gut mesenchyme	Present	Scattered	3A

Structure	Level	Pattern	Image	Note
TS17: enteric nervous system	Present	Single cells	3B	Only a few lightly-stained cells were seen.
TS17: gut mesenchyme	Present	Single cells	3B	Only a few lightly-stained cells were seen.

Structure	Level	Pattern	Image	Note
TS19: enteric nervous system	Present	Regionally restricted	4A	Expressed as an incomplete ring in proximal intestinal loops, still scattered more distally.
TS19: intestine mesenchyme	Present	Regionally restricted	4A	Expressed as an incomplete ring in proximal intestinal loops, still scattered more distally.

Structure	Level	Pattern	Image	Note
TS19: enteric nervous system	Present	Regionally restricted	4B	Expressed only in the mesenchyme of the lateral wall of the stomach and not more distally in the gastrointestinal tract.
TS19: stomach mesenchyme	Present	Regionally restricted	4B	Expressed only in the mesenchyme of the lateral wall of the stomach and not more distally in the gastrointestinal tract.
TS19: intestine mesenchyme	Absent		4B