Antibody:	anti-Erbb2 (C18; sc-284)
Detection system:	Biotinylated secondary antibody/[Strept]avidin coupled to horseradish peroxidase
Assay notes:	Fixative was either: 4% paraformaldehyde, formalin, or Carnoy's fixative.

Structure	Level	Pattern	Image	Note
TS18: dorsal root ganglion	Present		3c
TS18: embryo mesenchyme	Present		3c
TS18: heart atrium	Present		3c
TS18: primitive ventricle	Present		3c
TS18: somite	Present		3c
TS18: urogenital ridge	Present		3c
TS18: neural tube lateral wall	Present	Regionally restricted	3c	Expression is in motorneurons.

Structure	Level	Pattern	Image	Note
TS20: mammary bud	Present		3d
TS20: epidermis	Present	Regionally restricted	3d	Expression is in the surface epithelium adjacent to the mammary bud.

Structure	Level	Pattern	Image	Note
TS21: epidermis	Present	Regionally restricted	3e	Expression is in the basal layer.
TS21: mammary gland primordium epithelium	Present	Regionally restricted	3e	Expression is in the basal layer.
TS21: connective tissue	Present	Regionally restricted	3e	Expression is at the site of the future fat pad.
TS21: mammary mesenchyme	Present	Regionally restricted	3e	Expression is in the mesenchyme in the vicinity of the future site of the fat pad.

Structure	Level	Pattern	Image	Note
TS22: epidermis	Moderate	Regionally restricted	3f	Expression is in the surface epithelium adjacent to the mammary bud.
TS22: mammary bud	Moderate		3f	Moderate expression in the neck of the mammary bud and weak in the mature mammary bud.
TS22: mammary mesenchyme	Present	Regionally restricted	3f	Expression is in the mesenchyme in the vicinity of the future site of the fat pad.
TS22: connective tissue	Present	Regionally restricted	3f	Expression is at the site of the future fat pad.

Structure	Level	Pattern	Image	Note
TS20: mammary bud	Present		S2_Erbb2