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The effect of various concentrations of pure SWCNTs, Pl-PEG 2000-SWCNTs and Pl-PEG 5000-SWCNTs on the viability of Jurkat cells, following 24, 48 and 72 h (n = 3). Viability measured as (number of cells in each test group after 24 h÷ number of cells in control group after 24 h) × 100
