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Compared susceptibility of lymphocytes and MCF7 cells to infection of 106 cells by HIV-1 IIIb, an SI 496 isolate, or an NSI 82 isolate. Viruses were also inoculated into MCF7 cells which had been grown for 72 h in stripped medium devoid of estrogens. The cells remained in this medium after viral infection. The mean of an experiment in duplicate, with 3 to 10% variability, is shown.
