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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Too much acid and pepsin can damage a healthy stomach lining and cause ulcers. Most times the damage is caused by other factors first, weakening the stomach linings protective mucus layer defenses to a point when even an ordinary level of gastric acid can cause an ulcer.