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A phagosome is a vesicle formed around a particle engulfed by a phagocyte via phagocytosis. It eventually fuses with lysosomes to digest the ingested material.
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Phagocytosis: The process by which a cell engulfs particles such as bacteria, other microorganisms, aged red blood cells, foreign matter, etc.
Lysosome: An organelle containing digestive enzymes that breaks down waste materials and cellular debris.
Antigen-Presenting Cell (APC): A cell that displays foreign antigens complexed with major histocompatibility complexes on their surfaces.