The mononuclear cell shown here is a lymphocyte. A mature lymphocyte is the smallest of the white blood cells. The nucleus is about the size of a mature red cell. In fact, the size of red cells may be estimated by comparing them to the size of the lymphocyte nucleus. The nucleus stains dark, with small aggregates of chromatin piled up like dips of ice cream over the smooth, velvety chromatin. There may be a heavy condensation of chromatin around the edge of the nucleus. The cytoplasm is usually scanty and pure blue, either sky blue or deep blue.
Course Section: 03. Blood Smears Stained with Wright's Stain
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