Antibody:	Phospho-MEK1/2 (Ser217/221) (9121)
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase
Assay notes:	Antibody recognizes the phosphorylated form of both Map2k1 (MGI:1346866) and Map2k2 (MGI:1346867); both genes were annotated.

Structure	Level	Pattern	Image	Note
TS19: oral region	Present	Regionally restricted		Expression in the developing submandibular gland
TS19: palatal shelf	Present			Expression in the putative palatal process.

Structure	Level	Pattern	Image	Note
TS21: oral region	Present	Regionally restricted	2A	Expression in oral epithelium and mesenchyme, especially oral mucosa.
TS21: oral epithelium	Moderate		2A

Structure	Level	Pattern	Image	Note
TS21: palatal shelf epithelium	Strong		2B
TS21: palatal shelf mesenchyme	Strong		2B

Structure	Level	Pattern	Image	Note
TS21: tongue epithelium	Strong		2C
TS21: tongue mesenchyme	Strong		2C

Structure	Level	Pattern	Image	Note
TS21: tooth	Absent		2D

Structure	Level	Pattern	Image	Note
TS22: oral region	Present	Regionally restricted	2E	Expression in oral epithelium and mesenchyme, especially oral mucosa.
TS22: oral epithelium	Present		2E

Structure	Level	Pattern	Image	Note
TS22: palatal shelf	Strong		2F

Structure	Level	Pattern	Image	Note
TS22: tongue epithelium	Strong		2G
TS22: tongue mesenchyme	Strong		2G

Structure	Level	Pattern	Image	Note
TS22: dental papilla	Weak		2H
TS22: dental sac	Weak		2H

Structure	Level	Pattern	Image	Note
TS23: oral region	Present	Regionally restricted	2I	Expression in oral epithelium and mesenchyme, especially oral mucosa.
TS23: oral epithelium	Present		2I

Structure	Level	Pattern	Image	Note
TS23: palatal shelf epithelium	Present	Regionally restricted	2J	Stronger expression in oral epithelium than in the nasal palate epithelium.

Structure	Level	Pattern	Image	Note
TS23: tongue epithelium	Weak		2K
TS23: tongue mesenchyme	Weak		2K

Structure	Level	Pattern	Image	Note
TS23: dental papilla	Weak		2L
TS23: dental sac	Weak		2L
TS23: tooth epithelium	Present	Widespread	2L	Expression throughout dental epithelium, including inner dental epithelium, stratum intermedium, stellate reticulum and outer dental epithelium.
TS23: stellate reticulum	Present		2L
TS23: stratum intermedium	Present		2L

Structure	Level	Pattern	Image	Note
TS24: oral region	Present	Regionally restricted	2M	Expression in oral epithelium and mesenchyme, especially the oral mucosa.

Structure	Level	Pattern	Image	Note
TS24: oral epithelium	Present		2N

Structure	Level	Pattern	Image	Note
TS24: tongue epithelium	Present		2O
TS24: tongue mesenchyme	Present		2O
TS24: fungiform papillae	Present	Regionally restricted	2O	No expression in the inner layer of the developing fungiform papilla.

Structure	Level	Pattern	Image	Note
TS24: tooth	Present	Widespread	2P
TS24: cervical loop	Present	Regionally restricted	2P	Expression in cervical loop epithelium.
TS24: dental papilla	Present		2P
TS24: dental sac	Present		2P