Probe:	Shh cDNA5
Probe preparation:	Antisense labelled with S35 RNA

Structure	Level	Pattern	Image	Note
TS19: mandibular process	Present	Regionally restricted	1B	Expression seen in the epithelial thickenings of all the tooth germs.
TS19: maxillary process	Present	Regionally restricted	1B	Expression seen in the epithelial thickenings of all the tooth germs.

Structure	Level	Pattern	Image	Note
TS20: mandibular process	Strong	Regionally restricted	1H	Expression intensified at the early bud stage in both the maxillary and mandibular incisors.
TS20: maxillary process	Strong	Regionally restricted	1H	Expression intensified at the early bud stage in both the maxillary and mandibular incisors.

Structure	Level	Pattern	Image	Note
TS21: lower jaw tooth epithelium	Present	Regionally restricted	1N	Expression restricted to cells that will form the enamel knot.
TS21: upper jaw tooth epithelium	Present	Regionally restricted	1N	Expression restricted to cells that will form the enamel knot.

Structure	Level	Pattern	Image	Note
TS22: lower jaw tooth enamel organ	Present	Regionally restricted	1T , 1Z	Expression clearly marks the enamel knot.
TS22: upper jaw tooth enamel organ	Present	Regionally restricted	1T , 1Z	Expression clearly marks the enamel knot.
TS22: enamel knot	Present		1Z , 1T

Structure	Level	Pattern	Image	Note
TS22: upper jaw incisor	Present