The process where cells or particles clump together because of their own properties, without needing an external agent to make them stick.
From 'auto-' (self) and 'agglutination' (the act of gluing together). This medical term became established as immunology developed in the 20th century.
Red blood cells can undergo autoagglutination in certain diseases, which is why doctors look for this sign in blood tests—it tells them the immune system is attacking the body's own cells.
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