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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How stomach ulcers heal is related to their cause. Stomach ulcers may be caused by a number of things, including: 1  H. pylori, bacteria that exists in the stomachs of nearly half of the worldâs population.  Eating foods that cause too much acid production or degradation of the mucous lining in the stomach.