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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When a peptic ulcer affects the stomach it is called a gastric ulcer, one in the duodenum is called a duodenal ulcer, while an esophageal ulcer is an ulcer in the esophagus. When the lining of these organs is corroded by acidic digestive juices secreted by stomach cells peptic ulcers can form. Scarring may also cause vomiting and weight loss. 2  Pyloric stenosis-chronic inflammation in the lining of the stomach or duodenum caused by a peptic ulcer can result in a narrowing of the pylorus (small passage that links the stomach and the duodenum). 3  Pyloric stenosis is the narrowing of the pylorus.