A neutrophil is a type of mature (developed) white blood cell that is present in the blood. Approximately 50% to 70% of white blood cells are neutrophils. Neutrophils are essential in protecting the body against disease and infections by removing and destroying some types of bacteria, wastes, foreign substances, and other cells. Also known as polymorphonuclear leukocytes, they are the most common type of blood-carried white blood cell, and the first mobile resistance cell to come to the rescue in injury.
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