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Absence of a functional proteasome in the suprabasal layers of the epidermis is responsible for keratosis linearis with ichthyosis congenital and sclerosing keratoderma syndrome. Patient epidermis shows hypergranulosis associated with abnormally shaped keratohyalin granules and abnormal distribution of filaggrin in the Stratum granulosum and Stratum corneum. This suggests that the proteasome is involved...