Probe:	Hoxa4 probe7
Probe preparation:	Antisense labelled with digoxigenin RNA

Structure	Level	Pattern	Image	Note
TS21: vibrissa follicle	Present		1A	Expression was detected throughout the vibrissa follicle placode.

Structure	Level	Pattern	Image	Note
TS21: vibrissa follicle	Present	Regionally restricted	1B	Expression was detected in the lower portion of the vibrissa follicle peg adjacent to the dermal papilla.

Structure	Level	Pattern	Image	Note
TS21: vibrissa follicle	Present	Regionally restricted	1C	Expression was detected in the innermost layer of the matrix.

Structure	Level	Pattern	Image	Note
TS23: vibrissa follicle	Present	Regionally restricted	1E	Expression was detected in Henle's layer of the inner root sheath. No expression was in Huxley's layer of the inner root sheath, in the outer root sheath, or in connective tissue sheath.

Structure	Level	Pattern	Image	Note
TS24: vibrissa follicle	Present	Regionally restricted	1F	Expression was detected in Henle's layer of the inner root sheath. No expression was in Huxley's layer of the inner root sheath, in the outer root sheath, or in connective tissue sheath.

Structure	Level	Pattern	Image	Note
TS26: vibrissa follicle	Present	Regionally restricted	1G	Expression was detected in Henle's layer of the inner root sheath. No expression was in Huxley's layer of the inner root sheath, in the outer root sheath, or in connective tissue sheath.

Structure	Level	Pattern	Image	Note
TS26: vibrissa follicle	Absent		1I	No expression was seen in a section from the maxillary region.

Structure	Level	Pattern	Image	Note
TS24: vibrissa follicle	Present		1K

Structure	Level	Pattern	Image	Note
TS27: vibrissa follicle	Present	Regionally restricted	1L	Expression was detected in the inner root sheath.

Structure	Level	Pattern	Image	Note
TS27: vibrissa follicle	Present	Regionally restricted	1M	Expression was detected in the inner root sheath.

Structure	Level	Pattern	Image	Note
TS27: hair inner root sheath	Present		2A	Expression was detected in inner rooth sheath precursor cells at stages 2-4.
TS27: hair root sheath matrix	Present		2A	Expression was detected in matrix cells at stage 4.
TS27: epidermis	Present	Regionally restricted	2A	Expression was detected in interfollicular epidermis.

Structure	Level	Pattern	Image	Note
TS27: hair root sheath matrix	Present		2B	Expression was detected in matrix cells at stage 4.
TS27: dermis papillary layer	Absent		2B

Structure	Level	Pattern	Image	Note
TS27: hair inner root sheath	Present		2C	Expression was detected at stage 7-8.
TS27: hair outer root sheath	Present		2C	Expression was detected at stage 7-8.
TS27: epidermis	Present	Regionally restricted	2C	Expression was detected in interfollicular epidermis.

Structure	Level	Pattern	Image	Note
TS27: hair follicle	Absent		2D

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Absent		2E

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Absent		2F

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Absent

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Absent		2G

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Absent		2H