Basal and supra-basal layer cellular cytoplasm

Hair follicles ◦ Basal and supra-basal cells ◦ Outer and inner epithelial root sheaths

Arrector pili muscles

Sweat glands ◦ Secretory and ductal cells

Sebaceous glands

Mast cells, fibroblasts, and endothelial cells

Lymph nodes ◦ Strong B-cell zone immunoreactivity ◦ Primarily in the terminal centers of secondary follicles

Upregulated in atopic dermatitis