Definition: A target or Mexican hat cell, an unusually thin or flattened red blood cell with a central rounded area of pigmented material, a middle clear zone that contains no pigment, and an outer pigmented rim at the edge of the cell. Leptocytes are thought to be erythrocytes in which the cellular envelope or membrane is unusually large in proportion to its contents.
[lepto- + G. kytos, cell]
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Examples: glitazone, GI cocktail, etc.