Lymphocytes

**Definition:** White blood cells formed in the body's lymphoid tissue. The nucleus is round or ovoid with coarse, irregularly clumped chromatin while the cytoplasm is typically pale blue with azurophilic (if any) granules. Most lymphocytes can be classified as either T or B (with subpopulations of each), or NATURAL KILLER CELLS.

**Tree numbers:** - A11.118.637.555.567 - A15.145.229.637.555.567 - A15.382.490.555.567