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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Peptic ulcer Peptic ulcers, sores in the lining of the stomach or upper intestine, cause abdominal pain, gas, and more. Food poisoning Food poisoning can cause abdominal pain, diarrhea, nausea, vomiting, fever, chills, and weakness.