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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1 Helicobacter pylori infection: H. pylori is a bacterium that commonly infects the inner lining (the mucosa) of the stomach. 2  Infection with H. pylori can cause stomach inflammation and peptic ulcers. 3  It also increases the risk of stomach cancer, but only a small number of infected people develop stomach cancer.