This slide shows a monocyte.   This largest WBC is approximately twice the size of the surrounding erythrocytes.  Note the large, kidney bean-shaped nucleus with a faint, lightly blue-staining (agranular) cytoplasm.   Monocytes are typically found in a frequency of 4-8%.  

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The address of A/P Lab is:  http://bioweb.uwlax.edu/aplab/      Direct comments or questions to gillis.rick@uwlax.edu