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IFN-γ secretion by PBMCs of subjects that responded to HBcAg stimulation. The percentages of responders as well as the secreted IFN-γ levels from PBMCs after a 72-h incubation with HBcAg at birth, 1 and 6 months of age are shown. HBcAg, hepatitis B core antigen; IFN, interferon; PBMC, peripheral blood mononuclear cell.
