Chronic Inflammatory Dermatosis: Psoriasis
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Disorders of Epidermal Appendages: Acne Vulgaris
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True. The Ko (Kell null) phenotype is extremely rare. Individuals with this phenotype lack all Kell system antigens on their red cells due to mutations in the KEL gene. They can produce an antibody called anti-Ku (or anti-KEL5) if exposed to normal Kell-positive blood, which reacts with all Kell-positive cells.
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