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Anatomy of the human fingertip compared to the mouse digit tip. Both digit tips are similarly composed of a nail unit (dark pink), epidermis (orange), loose connective tissue dermis (light pink), vasculature (red), nerves (blue) and bone (brown). The second (P2) and third (P3) phalanges are indicated. Amputations removing the entire nail unit (indicated by the blue hatched line) result in regeneration failure.
