Neutrophils are white blood cells, or leukocytes, that are found in human blood. These white blood cells are distinguishable from the others, eosinophils and basophils, because they stain easily, allowing scientists to study them. All three types of white blood cells help humans to fight infections.
The neutrophils make up between 50 to 80 percent of the white blood cells in humans. Each of them measures between 12 and 15 micrometers and moves about like a one-celled amoeba. The nucleus has between two to five lobes surrounded like hair-like filaments. It takes roughly a week for a neutrophil to form in the bone marrow, but once it reaches the bloodstream, it only lives a few hours.