A substance that prevents or inhibits the action of cytolysin, a protein that breaks down cell membranes.
From anti- + cytolysin. Cytolysin comes from cyto- (cell, from Greek 'kytos') + -lysin (enzyme that causes lysis/breakdown). This biochemical term emerged in immunology research during the 20th century.
Your immune system produces anticytolysins as part of an internal defense strategy—they're like bodyguards protecting your cells from proteins that would otherwise poke holes in cell membranes, causing them to burst!
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