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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Keep a look out for these ulcer symptoms-they are common to all types of stomach ulcers caused by H. pylori-including gastric ulcers, duodenal ulcers, and peptic ulcers. - 1  H. pylori can cause painful inflammation of the stomach and small intestine lining.