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A method for the simultaneous measurement of cell surface components and nucleic acids (DNA and RNA) of human lymphocytes by flow cytometry has been developed, thereby providing a means of analyzing cell surface changes during the various phases of the cell cycle. Unfixed cells were coated with fluorescein-conjugated concanavalin A (F Con A) or surface antigen-specific antibody, fixed sequentially with paraformaldehyde and methanol, treated with specific nucleases, and then stained with propidium iodide. Neither portion of the procedure (cell surface staining, nucleic acid staining) interfered significantly with the other. Cell cycle phases of phytohemagglutinin-stimulated human lymphocytes as determined by this method were comparable with those identified by acridine orange staining. Cell cycle-specific blocking agents were used to additionally demonstrate the specificity of the staining procedure. Simultaneous measurement of cell cycle phase and detection of surface receptors for Con A and T lymphocyte surface determinants was performed with this method.

Simultaneous cell surface phenotype and cell cycle analysis of lymphocytes by flow cytometry.