The cells of the adaptive immune system are special types of leukocytes, called lymphocytes. B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow.
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No single cause has been found for stomach ulcers. However, experts report that an imbalance between digestive fluids in the stomach and duodenum can cause an ulcer. Most ulcers are caused by an infection from a type of bacteria called Helicobacter pylori (H. pylori).