Antinuclear antibody

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What Wikipedia says

Antinuclear antibodies (ANAs, also known as antinuclear factor or ANF) are autoantibodies that bind to contents of the cell nucleus. In normal individuals, the immune system produces antibodies to foreign proteins (antigens) but not to human proteins (autoantigens).

Excerpt from the Wikipedia article “Antinuclear antibody”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BQUB14-Amorant, CC BY-SA 4.0, via Wikimedia Commons.