Antinuclear antibody, Lupus erythematosus
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The anti-nuclear antibody test is often used to diagnose lupus erythmatosis. The patient's serum is incubated with a unicellular organism (Crithidia). Auto-antibodies to nuclear proteins will give rise to green fluorescence, following incubation with a second, fluorocein-labeled anti-human antibody (Copyright 1996, University of Utah)