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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10 Signs You May Have an Ulcer. An ulcer is like a nasty canker sore (or crater) that typically develops either on the lining of the stomach (a gastric or peptic ulcer) or at the opening of the small intestine in the duodenum (a duodenal or peptic ulcer). Ulcers occur due to an imbalance of digestive juices or if the stomach lining suffers some form of damage (i.e., alcoholism). An ulcer can be extremely painful, so itâs difficult to ignore if you develop one. However, if left untreated, the ulcer can eat into the stomach wall causing a perforated ulcer or the blood vessels causing a bleeding ulcer, and resulting in damaging and excruciating health complications.