Antibody:	anti-K15 (UC55)
Detection system:	Secondary antibody coupled to fluorescein

Structure	Level	Pattern	Image	Note
TS27: oral epithelium	Present	Regionally restricted	1a	Expression mostly restricted to undifferentiated basal cells of keratinizing oral epithelium of roof of mouth.

Structure	Level	Pattern	Image	Note
TS27: oral epithelium	Present	Regionally restricted	1b	Expression in many layers of non-keratinizing oral epithelium.

Structure	Level	Pattern	Image	Note
TS27: tongue keratinized epithelium	Present	Regionally restricted	1c	Expression localized to undifferentiated basal cells of keratinized stratified squamous epithelium on dorsal surface of tongue.

Structure	Level	Pattern	Image	Note
TS27: tongue epithelium	Present	Regionally restricted	1d	Expression in continuous non-keratinized epithelium on ventral surface of tongue.

Structure	Level	Pattern	Image	Note
TS27: stomach proventricular region epithelium	Present	Regionally restricted	1e	Expression in stratified epithelium of forestomach.
TS27: stomach glandular region epithelium	Absent		1e	No expression in simple columnar epithelium of glandular compartment of stomach.

Structure	Level	Pattern	Image	Note
TS27: vibrissa follicle	Present	Regionally restricted	1f	Expression in several layers of whisker follicle.

Structure	Level	Pattern	Image	Note
TS27: proximal nail fold	Present	Regionally restricted	1h	Expression only in basal compartment of proximal nail fold.

Structure	Level	Pattern	Image	Note
TS17: surface ectoderm	Absent			No expression in ectodermal layer of embryo.

Structure	Level	Pattern	Image	Note
TS20: epidermis basal layer	Present		2a	Expression in basal cell layer of ectoderm and overlying periderm.
TS20: periderm	Present		2a	Expression in basal cell layer of ectoderm and overlying periderm.

Structure	Level	Pattern	Image	Note
TS21: epidermis basal layer	Present		2b	Expression in basal cell layer of ectoderm and overlying periderm.
TS21: periderm	Present		2b	Expression in basal cell layer of ectoderm and overlying periderm.
TS21: epidermis	Present	Regionally restricted	2b	No expression in intermediate cells between basal layer and periderm.

Structure	Level	Pattern	Image	Note
TS22: epidermis basal layer	Present	Regionally restricted	2c	Expression in basal cell layer of ectoderm and overlying periderm.
TS22: periderm	Present	Regionally restricted	2c	Expression in basal cell layer of ectoderm and overlying periderm.
TS22: epidermis	Present	Regionally restricted	2c	No expression in an intermediate layer of cells between basal layer and periderm.
TS22: hair epidermal placode	Absent		2c	No expression where initial peg formation is evident.

Structure	Level	Pattern	Image	Note
TS23: epidermis basal layer	Present		2d	Expression in basal cell layer of ectoderm.
TS23: periderm	Very strong		2d	Very strong expression in overlying periderm.
TS23: hair germ	Present	Regionally restricted	2d	Expression in cells emerging into peg of developing hair follicle.

Structure	Level	Pattern	Image	Note
TS24: epidermis basal layer	Present		2e	Expression in basal cell layer of ectoderm.
TS24: periderm	Very strong		2e	Very strong expression in overlying periderm.
TS24: hair peg	Present		2e	Expression in cells emerging into peg of developing hair follicle.

Structure	Level	Pattern	Image	Note
TS25: epidermis basal layer	Present		2f	Expression in basal cell layer of ectoderm.
TS25: hair peg	Present	Regionally restricted	2f	As hair peg elongates, leading edge of expression restricted to outer root sheath.

Structure	Level	Pattern	Image	Note
TS26: epidermis basal layer	Present		2g	Expression in basal cell layer of ectoderm.
TS26: hair peg	Present	Regionally restricted	2g	As hair peg elongates, leading edge of expression restricted to outer root sheath.

Structure	Level	Pattern	Image	Note
TS27: epidermis basal layer	Present		2h	Expression in basal cell layer of ectoderm.
TS27: hair outer root sheath	Present	Regionally restricted	2h	As hair peg elongates, leading edge of expression restricted to outer root sheath.
TS27: hair peg	Present	Regionally restricted	2h	As hair peg elongates, leading edge of expression restricted to outer root sheath.

Structure	Level	Pattern	Image	Note
TS28: hair outer root sheath	Present		2i	Expression restricted to outer root sheath
TS28: hair bulb	Present	Regionally restricted	2i	Expression restricted to base of hair bulb.