Neutrophils are the most abundant type of white blood cells in humans, accounting for 40-65% of white blood cells. Their number increase up to ten times during infection. They are formed from stem cells made in blood marrow and are part of the innate immune system.
- Edwards, Steven W. (1994). Biochemistry and physiology of the neutrophil. Cambridge University Press. p. 6. ISBN 0-521-41698-1.