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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It used to be thought that stomach ulcers may be caused by certain lifestyle factors, such as spicy foods, stress and alcohol. There is little hard evidence to confirm that this is the case, but these factors may make the symptoms of ulcers worse.