The answer is the E. Mast cells
Leukocytes or white blood cells are part of the immune system which functions to protect itself from infection or disease. White blood cells are produced from hematopoietic stem cells in the bone marrow.
Mast cells are a type of white blood cell. Mast cells are formed in the bone marrow. These cells then spread throughout the body by way of the blood to the appropriate tissues and out of the blood vessels. Mast cells will react when a foreign object enters the body as part of the immune system. Mast cells will produce leukotriene and prostaglandinsin responses to allergen binding.
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