"Shadow" cells as clues to follicular differentiation.
D002454:Cell Differentiation; D002467:Cell Nucleus / Q000473:pathology; D006197:Hair / Q000473:pathology*; D006201:Hair Diseases / Q000473:pathology; D006801:Humans; D012867:Skin / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*