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Effects of increasing concentrations of gp120 from four different isolates (gp120MN, gp120SF2, gp120LAV, gp120CM) on histamine secretion from HLMCs obtained from four different preparations of HLMCs obtained from donors negative for HIV-1 antibodies. HLMCs were incubated (30 min at 37 °C) with the indicated concentrations of gp120. Each point shows the mean ± SEM obtained from four different experiments.
