Neutrophils are phagocytic granulocytes that spend most of their lives circulating in peripheral blood. Within the blood stream they account for approximately 60% of all leukocytes. Once stimulated by a sequence of inflammatory events, neutrophils are one of the first of the inflammatory cells to migrate to areas of infection or tissue injury where they engulf bacteria, other microorganisms, and microscopic particles. Umbilical cord blood neutrophils from Creative Bioarray are isolated from whole cord blood, which is collected from mothers that are negative for HIV, HepB, and HepC during pregnancy.