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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Marshall and Warren established that H. pylori infection causes ulcers in the stomach and the duodenum. The bug seemed to cause about half of stomach ulcers, and 90 % of the much more common duodenal ulcers, H. pylori,