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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H. pylori bacteria burrow into the cells of the stomach lining and cause gastritis. H. pylori is the most common cause of gastric ulcers and gastritis. Ten percent of those infected with H. pylori may develop an ulcer. Also, those infected have an increased risk of stomach cancer and lymphoma. Symptoms of H. pylori infection include bloating,