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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Stomach ulcers are lesions in the stomach, esophagus and small intestine caused by the bacteria Helicobacter pylori (H. pylori). Heredity, age, history of chronic pain, alcohol use, diabetes, stress and smoking are all risk factors for developing stomach ulcers.void spicy foods, such as chilies, hot peppers and hot sauce. These foods can increase stomach acid, trigger acid reflux and worsen symptoms associated with stomach ulcers.