agranulocytes
Also known as mononuclear leukocyte, nongranular leukocyte, Leukocytes, Mononuclear, agranulocyte
thumb|250px|Monocyte under a light microscope (40x) from a peripheral blood smear surrounded by [[red blood cells.]]
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thumb|250px|Monocyte under a light microscope (40x) from a peripheral blood smear surrounded by [[red blood cells.]]
In immunology, agranulocytes (also known as nongranulocytes or mononuclear leukocytes) are one of the two types of leukocytes (white blood cells), the other type being granulocytes. Agranular cells are noted by the absence of granules in their cytoplasm, which distinguishes them from granulocytes. Leukocytes are the first level of protection against disease. The two types of agranulocytes in the blood circulation are lymphocytes and monocytes. These make up about 35% of the hematologic blood values.