Absence of KX antigen and of normal expression of the Kell system antigens is associated with bizarre red blood cell morphology when observed by either light or scanning electron microscopy. Numerous acanthocytes and dacryocytes have been observed in the peripheral blood smear of an apparently healthy individual with McLeod-phenotype blood, in a male patient with type II chronic granulomatous disease who had a shortened 51Cr red blood cell survival time, and in a minor population of the red blood cells of his carrier mother.

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