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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Save. Stomach ulcers, or gastric ulcers, are sores that develop in the stomach, usually as a result of an infection caused by Helicobacter pylori bacteria. In the past, it was thought that diet and stress played a role. Common symptoms of gastric ulcers include abdominal pain, heartburn, nausea and weight loss.