• Plasma cells are activated B cells that secrete antibodies.
  • Antibodies are large, Y-shaped proteins that recognize and bind to antigens.
  • The antibodies travel throughout the body in blood and lymph.
  • Long-living plasma cells are called memory cells.
  • They retain a “memory” of a specific pathogen long after an infection is over.
  • They help launch a rapid response against the pathogen if it invades the body again in the future.
  • They may even survive for the lifetime of the individual.
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