This slide shows a lymphocyte (the second most commonly encountered WBC with a normal frequency of 20-45%) surrounded by several red blood cells (erythrocytes).  Note the dark, purple compact nucleus with a halo of light blue, agranular cytoplasm. 

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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