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Cell proliferation was followed for 7 generations using the CellTrace™ Far Red reagent. Human T lymphocytes were harvested and stained with CellTrace™ Far Red prior to stimulation with anti-human CD3 (Cat. no. MHCD0300) for 5 days. The discrete peaks in these histograms represent successive generations of live, SYTOX® Green (Cat. no. S34860) negative cells. The unstimulated parent generation is indicated in purple. Analysis was completed for CellTrace™ Far Red using an Attune® Acoustic Focusing Cytometer with 638 nm excitation and a 660/20 nm bandpass emission filter.