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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Typical symptoms of stomach ulcers include: 1  Continual indigestion. 2  Fatigue (in the case of a bleeding ulcer) 3  Poor appetite. 4  Nausea. Vomiting.  Black bowel 1  movements. Dizziness.  Anemia.