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From Biology-Online Dictionary | Biology-Online Dictionary
noun, plural: opsonins
Any substance (e.g. antibody) that binds to the surface of a particle (e.g. antigen) to enhance the uptake of the particle by a phagocyte (e.g. macrophage)
Opsonins are essential in immunological protection of the host against pathogenic bacteria. Opsonins in the surface of the antigen serve as "flags" to indicate that the antigen need to be destroyed by the action of the immune system.