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Results of a single neutralization assay with coded sera (1:50) tested against two concentrations of HCV genotype 1a pp. Shown is the mean percent of cells positive for GFP (determined by FACS analysis), compared with the mean percent infected in the presence of the same dilution of the two normal sera, set to 100%. Samples 683 and 691, normal human sera; Vu, patient with chronic HCV infection; bars, standard deviation of the two determinations.
