Final answer:
Monocytes differentiate into macrophages and dendritic cells to form the mononuclear phagocytic system.
Explanation:
The mononuclear phagocytic system is made up of monocytes, which are a type of white blood cell. Monocytes differentiate into macrophages and dendritic cells when they leave the blood and enter the tissue. Macrophages and dendritic cells are crucial in phagocytosis and as antigen-presenting cells.
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