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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Stomach ulcers caused by Helicobacter pylori (H pylori) infection. Early research suggests that taking berberine three times daily for 6 weeks is more effective than the drug ranitidine at eliminating H. pylori infection, but less effective at healing ulcers in people with stomach ulcers due to H. pylori.