This cell is a basophilic lymphocyte. Small basophilic lymphocytes may vary from 6 microns - 9 microns in diameter and large ones from 15 microns - 20 microns. There are also intermediate forms. Probably the size has no significance. These basophilic or young lymphocytes are nonspecific as they are present in many diseases but especially prevalent in infections. Basophilic lymphocytes are at times difficult to differentiate from young monocytes. However, the cytoplasm is usually bluer and the nuclei contain blocks of chromatin. These cells are also classed as stimulated or reactive lymphocytes.
Course Section: 04. Immature Cells in the Granulocytic - Monocytic - and Lymphocytic Series
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