Antibody:	anti-COX-2 (sc-1745)
Detection system:	Secondary antibody coupled to horseradish peroxidase

Structure	Level	Pattern	Image	Note
TS21: epidermis	Present		2A	Expression in epithelial precursor cells of embryonic epidermis prior to onset of epidermal stratification.

Structure	Cell Type	Level	Pattern	Image	Note
TS23: epidermis basal layer	basal cell of epidermis	Present		2B
TS23: periderm		Present		2B	Expression in outermost ectoderm periderm layer of stratified epidermis.
TS23: epidermis		Present	Regionally restricted	2B	No expression in differentiated layers in between.

Structure	Level	Pattern	Image	Note
TS26: hair germ	Present		2C	Expression in elongated hair germs and hair pegs at stages 2 and 3.
TS26: hair peg	Present		2C	Expression in elongated hair germs and hair pegs at stages 2 and 3.
TS26: hair follicle dermal papilla	Absent

Structure	Level	Pattern	Image	Note
TS26: hair germ	Present		2C inset	Expression in elongated hair germs and hair pegs at stages 2 and 3.
TS26: hair peg	Present		2C inset	Expression in elongated hair germs and hair pegs at stages 2 and 3.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: hair outer root sheath		Present	Regionally restricted	2D	Expression restricted to basal outer root sheath.
TS28: hair follicle		Present	Regionally restricted	2D	Expression in outer root sheath cells of distal and also proximal hair follicles.
TS28: sebaceous gland	basal cell of epidermis	Present	Regionally restricted	2D	Expression in basal cells of sebaceous gands.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: interfollicular epidermis	basal cell of epidermis	Present	Regionally restricted	2D inset	Expression in basal interfollicular epidermis.

Structure	Level	Pattern	Image	Note
TS28: hair outer root sheath	Present		2E	Expression in outer root sheath of growing hair follicles.

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Weak		2F	Expression declined in catagen hair follicles at P17.

Structure	Level	Pattern	Image	Note
TS28: hair follicle	Trace		2G	Expression barely detectable in telogen hair follicles at P21.

Structure	Level	Pattern	Image	Note
TS28: hair outer root sheath	Present	Regionally restricted	2H	Expression in outer root sheath of late anagen hair follicles at P28.

Structure	Level	Pattern	Image	Note
TS28: hair outer root sheath	Present	Regionally restricted	2H inset	Re-expression in outer root sheath of early anagen hair follicles at P25.

Structure	Cell Type	Level	Pattern	Image	Note
TS28: sebaceous gland	basal cell of epidermis	Present		2I	Expression in basal cells of sebaceous gands.
TS28: interfollicular epidermis		Trace		2I	Expression barely detectable in interfollicular epidermis.
TS28: hair follicle		Trace		2I	Expression barely detected in resting hair follicles.