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The cell volumes of mononuclear cells, T lymphocytes, B lymphocytes, and monocytes from the peripheral blood of 20 normal individuals were compared to neoplastic lymphoid cells from 14 patients with chronic lymphocytic leukaemia (CLL), 20 individuals with acute lymphocytic leukaemia (ALL), and 18 cases of non-Hodgkin's lymphoma (NHL). Normal T cells were obtained by rosetting mononuclear cells with sheep erythrocytes followed by centrifugation on a gradient composed of Ficoll and diatrizoate salts. Monocyte populations were prepared by adhering mononuclear cells to plastic dishes and B cells were obtained by the depletion of T lymphocytes and monocytes from a mononuclear cell population. Cell volumes were determined on a Coulter Counter Model H4 Channelyzer. In normals, the average mean cell volume (MCV) of T lymphocytes was smaller than B lymphocytes and the average MCV of B …