Probe:	Bmp4 probe16
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS18: lateral lingual swelling	Weak	Regionally restricted	1C	Expression is absent in the median sulcus.

Structure	Level	Pattern	Image	Note
TS19: lateral lingual swelling epithelium	Present	Graded	1G	Highest expression is at the periphery with an apparent down-regulation in the central area of the tongue.
TS19: median lingual swelling epithelium	Present	Graded	1G	Highest expression is at the periphery with an apparent down-regulation in the central area of the tongue.
TS19: dental placode	Present		1G	Expression is in the developing incisor and molar tooth buds.

Structure	Level	Pattern	Image	Note
TS20: lateral lingual swelling epithelium	Present	Spotted	1K	Expression in spots in the posterior part of the tongue and weakly in rows of spots running parallel to the median sulcus in the anterior part.
TS20: median lingual swelling epithelium	Present	Spotted	1K	Expression in spots in the posterior part of the tongue and weakly in rows of spots running parallel to the median sulcus in the anterior part.

Structure	Level	Pattern	Image	Note
TS21: tongue epithelium	Present	Spotted	1O	The expression is in punctate patches at regular intervals often symmetrically located in rows at both sides of the median sulcus.

Structure	Level	Pattern	Image	Note
TS22: tongue epithelium	Weak	Spotted	1R	There are fewer spots than at E13.5

Structure	Level	Pattern	Image	Note
TS23: tongue epithelium	Absent		1U	Authors report that expression is completely downregulated.

Structure	Level	Pattern	Image	Note
TS18: lateral lingual swelling epithelium	Strong	Regionally restricted	2C	Expression is in the dorsal epithelium.
TS18: median lingual swelling epithelium	Strong	Regionally restricted	2C	Expression is in the dorsal epithelium.
TS18: lateral lingual swelling mesenchyme	Weak		2C
TS18: median lingual swelling mesenchyme	Weak		2C

Structure	Level	Pattern	Image	Note
TS20: lateral lingual swelling epithelium	Present	Spotted	2G
TS20: median lingual swelling epithelium	Present	Spotted	2G

Structure	Level	Pattern	Image	Note
TS21: tongue epithelium	Present	Spotted	2K	Expression is in the dorsal epithelium.

Structure	Level	Pattern	Image	Note
TS21: tongue epithelium	Present	Single cells	2L	Expression is in a spot of 6-8 cells.

Structure	Level	Pattern	Image	Note
TS23: tongue epithelium	Absent		2O	Expression is completely downregulated in the dorsal epithelium.