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Ultrastructural features of detergent extracted hair fibres. (a–c) Normal albino BALB/cByJ+/+ hairs have a well defined septulation pattern with roughly square medullary cells. These desiccated ‘ghost cells’ retain their basic structural features. (d–f) In contrast, AKR/J-hid/hid hairs have no defined layering pattern. The medullary cells are rounded, amorphous, or disintegrating (asterisk). Contraction causes large empty spaces to form in the outline of the cells (bars = 2 µm).
