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Macrophages acquire greater Ag in presence of B cells. Macrophages were cultured for 4 h with the following: no Ag (dark gray curve), 10 μg/ml soluble Ag alone (light gray curve), 5 μg/ml soluble Ag in absence (dotted curve) or presence of BJAB cells (open curve with heavy line). Cells were stained for flow cytometry and the levels of transferred Ag were assessed for the CD19−CD14+-gated population.
