Mouse anti-Human Monocyte + Granulocyte monoclonal antibody for FC, IP, IHC-Fr. A monocyte is a leukocyte, part of the human body's immune system that protects against blood-borne pathogens and moves quickly (aprox. 8-12 hours) to sites of infection in the tissues. Monocytes are usually identified in stained smears by their large bi-