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In vitro coculture experiment. Freshly isolated rabbit PBMC were cocultured with γ-irradiated HTLV-1 producer cells (729ACH or 729.ACH.p13) for in vitro infectivity assay. A graph shows p19 matrix antigen production over 6 weeks of coculture. Average absorbance values ± standard deviations of quadruplicate samples are shown. P values were >0.05 for each time point (Student's t test). OD, optical density; 729(−), uninfected, HTLV-1-negative cells.
