Probe:	Apcdd1 probe1
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS20: dental placode	Present		1a	Expression was detected in the invaginated dental epithelium.

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar mesenchyme	Present	Regionally restricted	1b	Expression was detected in the condensed mesenchyme.

Structure	Level	Pattern	Image	Note
TS22: enamel knot	Present		1c	Expression was in lower molar enamel knot.
TS22: lower jaw molar enamel organ	Present	Regionally restricted	1c	Expression was detected in the inner enamel epithelium.

Structure	Level	Pattern	Image	Note
TS20: dental placode	Present		1d	Expression was detected in the invaginated dental epithelium.

Structure	Level	Pattern	Image	Note
TS21: lower jaw molar mesenchyme	Present	Regionally restricted	1e	Expression was detected in the condensed mesenchyme.

Structure	Level	Pattern	Image	Note
TS22: enamel knot	Present		1f	Expression was in lower molar enamel knot.
TS22: lower jaw molar enamel organ	Present	Regionally restricted	1f	Expression was detected in the inner enamel epithelium, but not in the outer enamel epithelium.
TS22: lower jaw molar mesenchyme	Absent		1f

Structure	Level	Pattern	Image	Note
TS23: enamel knot	Present		1g	Expression pattern in lower molar enamel knot was similar to E14.5.
TS23: lower jaw molar epithelium	Present	Regionally restricted	1g	Expression pattern in inner enamel epithelium was similar to E14.5.