Probe:	Slit1 cDNA3
Probe preparation:	Antisense labelled with S35 RNA
Assay notes:	Fixative was 12.5% ethylenediaminetetraacetic acid (EDTA), 2.5% phosphonoformatic acid (PFA).

Structure	Level	Pattern	Image	Note
TS24: lower jaw molar enamel organ	Present	Regionally restricted	1C	Expression is in the lingual and buccal secondary enamel knot and in stellate reticulum cells between the knots.
TS24: secondary enamel knot	Present		1C
TS24: early bell stage tooth	Present	Regionally restricted	1C

Structure	Level	Pattern	Image	Note
TS26: stratum intermedium	Present	Regionally restricted	1E/F	Expression is in cells between the cusps.
TS26: secondary enamel knot	Present		1E/F
TS26: stellate reticulum	Present		1E/F
TS26: lower jaw molar enamel organ	Present		1E/F

Structure	Level	Pattern	Image	Note
TS27: lower jaw molar	Present	Regionally restricted	1G/H	Expression is in the tertiary enamel knot on the mesial side of the lingual cusp tip.
TS27: stellate reticulum	Present		1G/H
TS27: stratum intermedium	Present		1G/H
TS27: tertiary enamel knot	Present		1G/H

Structure	Level	Pattern	Image	Note
TS27: lower jaw molar	Present	Regionally restricted	1I/J	Expression is in the tertiary enamel knot under the cusp tip and in adjacent epithelial cells.
TS27: tertiary enamel knot	Present		1I/J

Structure	Level	Pattern	Image	Note
TS28: lower jaw molar	Present	Regionally restricted	1K/L	Expression is between the cusp tips.

Structure	Level	Pattern	Image	Note
TS28: molar enamel organ	Present	Regionally restricted	1N/O , 1M	Expression is in the tertiary enamel knot on the mesial side of each cusp tips.
TS28: tertiary enamel knot	Present		1N/O , 1M

Structure	Level	Pattern	Image	Note
TS27: tertiary enamel knot	Present		2A/B