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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We will start with the most common symptoms of a stomach ulcer. Remember that if you have any form of stomach ulcer, it is highly likely that you are infected with H. pylori bacteria. If you are worried that you are indeed suffering from the symptoms of a stomach ulcer or a peptic ulcer, then a. is recommended. Keep a look out for these ulcer symptoms-they are common to all types of stomach ulcers caused by H. pylori-including gastric ulcers, duodenal ulcers, and peptic ulcers. - 1  H. pylori can cause painful inflammation of the stomach and small intestine lining. 2  Pain can also be caused by a build up of gases, and constipation.