• The lymphatic system is a major part of the immune system.
  • Lymphocytes are the key cells involved in the immune response.
  • They recognize and help destroy particular pathogens in body fluids and cells.
  • There are two major types of lymphocytes, called B cells and T cells.
  • B cells recognize and respond to antigens on pathogens.
  • Antigens are also found on cancer cells and the cells of transplanted organs.
  • This is why a transplanted organ may be rejected by the recipient’s immune.
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